fix a bug in AA::Inputs::FilterSelectInput#method
fix a bug in AA::Inputs::FilterSelectInput#method

This method takes something like "author_id" and returns "author". It
was failing for the edge case "external_identity_id" because of the
extra "_id" in the middle of the string - i.e. it was returning
"externalentity".

Change the way the substitution is done so that it only matches at the
end of the string.

Amandeepsinghghai/activeadmin,senid231/activeadmin,getkiwicom/activeadmin,applexiaohao/activeadmin,gogovan/activeadmin,chrisseldo/activeadmin,mohitnatoo/activeadmin,quikly/active_admin,seanski/activeadmin,tjgrathwell/activeadmin,buren/activeadmin,jclay/active_admin,FundingGates/activeadmin,Andrekra/activeadmin,samvincent/active_admin,ampinog/activeadmin,rtrepo/activeadmin,mynksngh/activeadmin,iuriandreazza/activeadmin,bcavileer/activeadmin,Ibotta/activeadmin,quikly/active_admin,Amandeepsinghghai/activeadmin,bloomrain/activeadmin,timoschilling/activeadmin,saiqulhaq/activeadmin,beyondthestory/activeadmin,getkiwicom/activeadmin,artofhuman/activeadmin,bolshakov/activeadmin,dhartoto/activeadmin,mrjman/activeadmin,siutin/activeadmin,westonplatter/activeadmin,scarver2/activeadmin,sanyaade-iot/activeadmin,bcavileer/activeadmin,zfben/activeadmin,adibsaad/activeadmin,dannyshafer/activeadmin,bcavileer/activeadmin,totzyuta/activeadmin,getkiwicom/activeadmin,hiroponz/activeadmin,sharma1nitish/activeadmin,mrjman/activeadmin,lampo/activeadmin,strivedi183/activeadmin,siutin/activeadmin,zfben/activeadmin,varyonic/activeadmin,mediebruket/activeadmin,timoschilling/activeadmin,beyondthestory/activeadmin,activeadmin/activeadmin,sanyaade-iot/activeadmin,presskey/activeadmin,thomascarterx/activeadmin,hiroponz/activeadmin,keichan34/active_admin,Ibotta/activeadmin,mohitnatoo/activeadmin,ishumilova/activeadmin,beyondthestory/activeadmin,scarver2/activeadmin,dannyshafer/activeadmin,artofhuman/activeadmin,Skulli/activeadmin,sharma1nitish/activeadmin,Davidzhu001/activeadmin,MohamedHegab/activeadmin,applexiaohao/activeadmin,yijiasu/activeadmin,senid231/activeadmin,krautcomputing/activeadmin,jethroo/activeadmin,senid231/activeadmin,westonplatter/activeadmin,krautcomputing/activeadmin,dhartoto/activeadmin,bolshakov/activeadmin,Andrekra/activeadmin,tf/activeadmin,Ryohu/activeadmin,vraravam/activeadmin,totzyuta/activeadmin,Ryohu/activeadmin,tjgrathwell/activeadmin,shishir127/activeadmin,yeti-switch/active_admin,iuriandreazza/activeadmin,tf/activeadmin,vytenis-s/activeadmin,bloomrain/activeadmin,alonerage/activeadmin,mwlang/active_admin,bloomrain/activeadmin,maysam/activeadmin,vraravam/activeadmin,davydovanton/activeadmin,mateusg/active_admin,dalegregory/activeadmin,keichan34/active_admin,ishumilova/activeadmin,iuriandreazza/activeadmin,danielevans/activeadmin,halilim/activeadmin,JeffreyATW/activeadmin,chdem/activeadmin,jethroo/activeadmin,alonerage/activeadmin,deivid-rodriguez/activeadmin,seanski/activeadmin,wspurgin/activeadmin,dhartoto/activeadmin,jclay/active_admin,chrisseldo/activeadmin,mauriciopasquier/active_admin,Pollywog23/activeadmin,iguchi1124/activeadmin,dalegregory/activeadmin,maysam/activeadmin,Some1Else/activeadmin,yeti-switch/active_admin,strivedi183/activeadmin,JeffreyATW/activeadmin,iuriandreazza/activeadmin,FundingGates/activeadmin,hyperoslo/activeadmin,totzyuta/activeadmin,iguchi1124/activeadmin,Davidzhu001/activeadmin,FundingGates/activeadmin,hobbes37/activeadmin,Skulli/activeadmin,mauriciopasquier/active_admin,SoftSwiss/active_admin,buren/activeadmin,tjgrathwell/activeadmin,rubixware/activeadmin,davydovanton/activeadmin,chdem/activeadmin,timoschilling/activeadmin,dalegregory/activeadmin,adibsaad/activeadmin,hiroponz/activeadmin,chrisseldo/activeadmin,westonplatter/activeadmin,strivedi183/activeadmin,artofhuman/activeadmin,wspurgin/activeadmin,temochka-test/activeadmin,tf/activeadmin,deivid-rodriguez/activeadmin,waymondo/active_admin,whatcould/active_admin,mwlang/active_admin,yijiasu/activeadmin,hobbes37/activeadmin,sanyaade-iot/activeadmin,quikly/active_admin,h2ocube/active_admin,Amandeepsinghghai/activeadmin,cmunozgar/activeadmin,mwlang/active_admin,Some1Else/activeadmin,mohitnatoo/activeadmin,lampo/activeadmin,whatcould/active_admin,seanski/activeadmin,samvincent/active_admin,temochka-test/activeadmin,ampinog/activeadmin,scarver2/activeadmin,vytenis-s/activeadmin,shishir127/activeadmin,hyperoslo/activeadmin,saveav/activeadmin,gogovan/activeadmin,Ibotta/activeadmin,cmunozgar/activeadmin,saiqulhaq/activeadmin,shishir127/activeadmin,cmunozgar/activeadmin,halilim/activeadmin,iuriandreazza/activeadmin,vytenis-s/activeadmin,mauriciopasquier/active_admin,krautcomputing/activeadmin,siutin/activeadmin,alonerage/activeadmin,deivid-rodriguez/activeadmin,wspurgin/activeadmin,mynksngh/activeadmin,jethroo/activeadmin,danielevans/activeadmin,varyonic/activeadmin,samvincent/active_admin,dannyshafer/activeadmin,Skulli/activeadmin,Some1Else/activeadmin,rtrepo/activeadmin,activeadmin/activeadmin,zfben/activeadmin,iuriandreazza/activeadmin,mediebruket/activeadmin,javierjulio/activeadmin,iuriandreazza/activeadmin,mediebruket/activeadmin,davydovanton/activeadmin,rtrepo/activeadmin,SoftSwiss/active_admin,rubixware/activeadmin,rubixware/activeadmin,Ryohu/activeadmin,thomascarterx/activeadmin,whatcould/active_admin,MohamedHegab/activeadmin,mateusg/active_admin,thomascarterx/activeadmin,presskey/activeadmin,JeffreyATW/activeadmin,buren/activeadmin,yijiasu/activeadmin,gogovan/activeadmin,danielevans/activeadmin,MohamedHegab/activeadmin,jclay/active_admin,maysam/activeadmin,javierjulio/activeadmin,mateusg/active_admin,halilim/activeadmin,waymondo/active_admin,javierjulio/activeadmin,mynksngh/activeadmin,ishumilova/activeadmin,applexiaohao/activeadmin,saveav/activeadmin,activeadmin/activeadmin,hyperoslo/activeadmin,lampo/activeadmin,adibsaad/activeadmin,h2ocube/active_admin,vraravam/activeadmin,saveav/activeadmin,ampinog/activeadmin,keichan34/active_admin,h2ocube/active_admin,SoftSwiss/active_admin,waymondo/active_admin,mrjman/activeadmin,Pollywog23/activeadmin,chdem/activeadmin,varyonic/activeadmin,yeti-switch/active_admin,saiqulhaq/activeadmin,hobbes37/activeadmin,bolshakov/activeadmin,Andrekra/activeadmin,Pollywog23/activeadmin,presskey/activeadmin,sharma1nitish/activeadmin,Davidzhu001/activeadmin,temochka-test/activeadmin,iguchi1124/activeadmin