remove warning from integer ext test
remove warning from integer ext test

this removes the following warning:

```
test/core_ext/integer_ext_test.rb:34: warning: ambiguous first argument; put parentheses or a space even after `-' operator
test/core_ext/integer_ext_test.rb:38: warning: ambiguous first argument; put parentheses or a space even after `-' operator
```

yasslab/railsguides.jp,arunagw/rails,travisofthenorth/rails,aditya-kapoor/rails,georgeclaghorn/rails,ttanimichi/rails,travisofthenorth/rails,ngpestelos/rails,rbhitchcock/rails,georgeclaghorn/rails,palkan/rails,gfvcastro/rails,odedniv/rails,felipecvo/rails,kenta-s/rails,printercu/rails,MSP-Greg/rails,yhirano55/rails,yahonda/rails,starknx/rails,eileencodes/rails,rails/rails,mechanicles/rails,MichaelSp/rails,vassilevsky/rails,untidy-hair/rails,illacceptanything/illacceptanything,rafaelfranca/omg-rails,mathieujobin/reduced-rails-for-travis,EmmaB/rails-1,yawboakye/rails,arjes/rails,tgxworld/rails,mtsmfm/rails,bolek/rails,Stellenticket/rails,rbhitchcock/rails,Sen-Zhang/rails,Vasfed/rails,odedniv/rails,brchristian/rails,richseviora/rails,88rabbit/newRails,illacceptanything/illacceptanything,rafaelfranca/omg-rails,gauravtiwari/rails,jeremy/rails,yawboakye/rails,BlakeWilliams/rails,mtsmfm/railstest,maicher/rails,eileencodes/rails,Vasfed/rails,jeremy/rails,Spin42/rails,odedniv/rails,sergey-alekseev/rails,deraru/rails,Stellenticket/rails,utilum/rails,mohitnatoo/rails,Envek/rails,illacceptanything/illacceptanything,lucasmazza/rails,MichaelSp/rails,esparta/rails,voray/rails,deraru/rails,utilum/rails,palkan/rails,lcreid/rails,tijwelch/rails,marklocklear/rails,flanger001/rails,repinel/rails,notapatch/rails,gcourtemanche/rails,kirs/rails-1,assain/rails,bogdanvlviv/rails,schuetzm/rails,repinel/rails,xlymian/rails,Vasfed/rails,esparta/rails,Erol/rails,notapatch/rails,pvalena/rails,Edouard-chin/rails,kirs/rails-1,ttanimichi/rails,illacceptanything/illacceptanything,yhirano55/rails,Sen-Zhang/rails,gfvcastro/rails,tjschuck/rails,tgxworld/rails,ngpestelos/rails,stefanmb/rails,kachick/rails,kmayer/rails,joonyou/rails,tijwelch/rails,coreyward/rails,yahonda/rails,samphilipd/rails,fabianoleittes/rails,esparta/rails,rails/rails,deraru/rails,illacceptanything/illacceptanything,kenta-s/rails,jeremy/rails,illacceptanything/illacceptanything,illacceptanything/illacceptanything,rossta/rails,untidy-hair/rails,stefanmb/rails,felipecvo/rails,shioyama/rails,lcreid/rails,elfassy/rails,baerjam/rails,notapatch/rails,bradleypriest/rails,mechanicles/rails,alecspopa/rails,esparta/rails,gcourtemanche/rails,pschambacher/rails,Edouard-chin/rails,bogdanvlviv/rails,bolek/rails,sealocal/rails,bogdanvlviv/rails,mijoharas/rails,pvalena/rails,arunagw/rails,gauravtiwari/rails,sergey-alekseev/rails,yalab/rails,hanystudy/rails,yalab/rails,palkan/rails,repinel/rails,gauravtiwari/rails,untidy-hair/rails,schuetzm/rails,richseviora/rails,mohitnatoo/rails,bogdanvlviv/rails,maicher/rails,mohitnatoo/rails,BlakeWilliams/rails,iainbeeston/rails,kmcphillips/rails,maicher/rails,ledestin/rails,betesh/rails,mijoharas/rails,Envek/rails,88rabbit/newRails,notapatch/rails,lucasmazza/rails,Spin42/rails,mathieujobin/reduced-rails-for-travis,kachick/rails,Vasfed/rails,fabianoleittes/rails,MSP-Greg/rails,illacceptanything/illacceptanything,Edouard-chin/rails,yasslab/railsguides.jp,betesh/rails,kamipo/rails,88rabbit/newRails,ledestin/rails,fabianoleittes/rails,MSP-Greg/rails,vipulnsward/rails,iainbeeston/rails,rbhitchcock/rails,kmcphillips/rails,illacceptanything/illacceptanything,kddeisz/rails,betesh/rails,kmcphillips/rails,deraru/rails,sergey-alekseev/rails,ngpestelos/rails,joonyou/rails,rafaelfranca/omg-rails,mechanicles/rails,mijoharas/rails,prathamesh-sonpatki/rails,pschambacher/rails,EmmaB/rails-1,ledestin/rails,aditya-kapoor/rails,illacceptanything/illacceptanything,fabianoleittes/rails,gavingmiller/rails,hanystudy/rails,gfvcastro/rails,pschambacher/rails,xlymian/rails,starknx/rails,yhirano55/rails,arunagw/rails,brchristian/rails,mathieujobin/reduced-rails-for-travis,prathamesh-sonpatki/rails,kddeisz/rails,tjschuck/rails,kmayer/rails,tjschuck/rails,kirs/rails-1,arjes/rails,samphilipd/rails,Erol/rails,gfvcastro/rails,mechanicles/rails,kmayer/rails,amoody2108/TechForJustice,samphilipd/rails,coreyward/rails,stefanmb/rails,joonyou/rails,kaspth/rails,brchristian/rails,sealocal/rails,alecspopa/rails,alecspopa/rails,kaspth/rails,gavingmiller/rails,yasslab/railsguides.jp,illacceptanything/illacceptanything,bradleypriest/rails,schuetzm/rails,bradleypriest/rails,betesh/rails,travisofthenorth/rails,BlakeWilliams/rails,MSP-Greg/rails,baerjam/rails,Erol/rails,printercu/rails,arjes/rails,baerjam/rails,Sen-Zhang/rails,georgeclaghorn/rails,Stellenticket/rails,riseshia/railsguides.kr,riseshia/railsguides.kr,yawboakye/rails,georgeclaghorn/rails,schuetzm/rails,amoody2108/TechForJustice,vipulnsward/rails,vassilevsky/rails,marklocklear/rails,koic/rails,amoody2108/TechForJustice,utilum/rails,kamipo/rails,arunagw/rails,koic/rails,kaspth/rails,yasslab/railsguides.jp,yahonda/rails,shioyama/rails,koic/rails,mtsmfm/railstest,pvalena/rails,illacceptanything/illacceptanything,sealocal/rails,Erol/rails,yhirano55/rails,matrinox/rails,assain/rails,mtsmfm/rails,untidy-hair/rails,rails/rails,Spin42/rails,kamipo/rails,yalab/rails,xlymian/rails,hanystudy/rails,kddeisz/rails,rails/rails,tgxworld/rails,voray/rai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