[signup] - Fix input fields tabindex attribute
[signup] - Fix input fields tabindex attribute

vntrp/app,mairwilliams/app,EuParticipo/Caxias,kant/app,ManuH/app,ManuH/app,josuedor/app,AbraaoAlves/app,ben-pr-p/app,beomjae/app,mxabierto/colaborativa,DemocraciaEnRed/comunas,mbhicks90/myvotes.ca,alexproca/democracy-os,okfn-brasil/euvoto,10Pines/app,beomjae/app,mgarciaisaia/democracy-os-ues,ben-pr-p/app,fonorobert/evoks,huulbaek/app,okfn-brasil/euvoto,DemocraciaEnRed/comunas,vntrp/app,PartidoDeLaRed/app,alexproca/democracy-os,indiofran/app,CivicTechFR/DemocracyOSFR,piratenfraktion-nrw/app,Nicolas-Lebreton/app,maiklaguna/app,DemocracyOS/app,solde9/app,AbraaoAlves/app,moustachu/democracy-os-app,PartidoDeLaRed/app,CivicTechFR/DemocracyOSFR,solde9/app,d-cent/democracyos,valentinchaput/app,fonorobert/evoks,kant/app,DemocraciaEnRed/bahiablanca,dkrathi457/app,johnardavies/democracyos-podemos,atlatszo/evoks,huulbaek/app,radvansky-tomas/app,johnardavies/democracyos-podemos,mairwilliams/app,dkrathi457/app,120photo/app,piratenfraktion-nrw/app,valentinchaput/app,mbhicks90/myvotes.ca,Nicolas-Lebreton/app,120photo/app,DemocracyOS/app,radvansky-tomas/app,DemocraciaEnRed/bahiablanca,atlatszo/evoks,MareAtlantica/democracyos,moustachu/democracy-os-app,EuParticipo/Caxias,MareAtlantica/democracyos,josuedor/app,indiofran/app