Fix symbols syntax in subs tests.
Fix symbols syntax in subs tests.

Use symbols('x y z') syntax instead of map(Symbol, 'xyz').

ga7g08/sympy,pbrady/sympy,hrashk/sympy,pbrady/sympy,vipulroxx/sympy,toolforger/sympy,ChristinaZografou/sympy,rahuldan/sympy,meghana1995/sympy,drufat/sympy,pandeyadarsh/sympy,kaichogami/sympy,AunShiLord/sympy,Sumith1896/sympy,liangjiaxing/sympy,sunny94/temp,Vishluck/sympy,madan96/sympy,mcdaniel67/sympy,souravsingh/sympy,Gadal/sympy,skidzo/sympy,grevutiu-gabriel/sympy,jaimahajan1997/sympy,Arafatk/sympy,mcdaniel67/sympy,hargup/sympy,yashsharan/sympy,MechCoder/sympy,maniteja123/sympy,Titan-C/sympy,Designist/sympy,AkademieOlympia/sympy,skidzo/sympy,vipulroxx/sympy,cccfran/sympy,hargup/sympy,atsao72/sympy,liangjiaxing/sympy,hargup/sympy,sampadsaha5/sympy,ga7g08/sympy,jaimahajan1997/sympy,wanglongqi/sympy,Mitchkoens/sympy,aktech/sympy,VaibhavAgarwalVA/sympy,kmacinnis/sympy,postvakje/sympy,Arafatk/sympy,wyom/sympy,bukzor/sympy,farhaanbukhsh/sympy,kevalds51/sympy,toolforger/sympy,Designist/sympy,Sumith1896/sympy,kevalds51/sympy,jbbskinny/sympy,moble/sympy,jerli/sympy,shipci/sympy,kumarkrishna/sympy,sahilshekhawat/sympy,kmacinnis/sympy,emon10005/sympy,Designist/sympy,bukzor/sympy,MechCoder/sympy,atsao72/sympy,beni55/sympy,Shaswat27/sympy,jaimahajan1997/sympy,cccfran/sympy,ahhda/sympy,yukoba/sympy,atreyv/sympy,Davidjohnwilson/sympy,jerli/sympy,mcdaniel67/sympy,debugger22/sympy,kaushik94/sympy,souravsingh/sympy,vipulroxx/sympy,Arafatk/sympy,souravsingh/sympy,VaibhavAgarwalVA/sympy,jamesblunt/sympy,Davidjohnwilson/sympy,wanglongqi/sympy,abloomston/sympy,atreyv/sympy,MechCoder/sympy,sampadsaha5/sympy,cswiercz/sympy,sampadsaha5/sympy,ahhda/sympy,maniteja123/sympy,Vishluck/sympy,postvakje/sympy,chaffra/sympy,ga7g08/sympy,wanglongqi/sympy,Mitchkoens/sympy,moble/sympy,sahilshekhawat/sympy,pandeyadarsh/sympy,farhaanbukhsh/sympy,Gadal/sympy,iamutkarshtiwari/sympy,lindsayad/sympy,AunShiLord/sympy,Sumith1896/sympy,atsao72/sympy,AkademieOlympia/sympy,postvakje/sympy,iamutkarshtiwari/sympy,sahmed95/sympy,cswiercz/sympy,VaibhavAgarwalVA/sympy,shipci/sympy,mafiya69/sympy,garvitr/sympy,sunny94/temp,wyom/sympy,Curious72/sympy,kaichogami/sympy,Gadal/sympy,Titan-C/sympy,Shaswat27/sympy,debugger22/sympy,saurabhjn76/sympy,toolforger/sympy,cccfran/sympy,dqnykamp/sympy,jbbskinny/sympy,drufat/sympy,Curious72/sympy,hrashk/sympy,hrashk/sympy,dqnykamp/sympy,shikil/sympy,AkademieOlympia/sympy,atreyv/sympy,abloomston/sympy,asm666/sympy,meghana1995/sympy,pandeyadarsh/sympy,moble/sympy,yukoba/sympy,aktech/sympy,dqnykamp/sympy,lindsayad/sympy,rahuldan/sympy,saurabhjn76/sympy,beni55/sympy,Vishluck/sympy,AunShiLord/sympy,Titan-C/sympy,sahilshekhawat/sympy,jamesblunt/sympy,yashsharan/sympy,oliverlee/sympy,garvitr/sympy,mafiya69/sympy,Curious72/sympy,chaffra/sympy,bukzor/sympy,mafiya69/sympy,shikil/sympy,pbrady/sympy,abhiii5459/sympy,shikil/sympy,maniteja123/sympy,chaffra/sympy,yukoba/sympy,grevutiu-gabriel/sympy,ChristinaZografou/sympy,kaichogami/sympy,ahhda/sympy,shipci/sympy,skidzo/sympy,kumarkrishna/sympy,kmacinnis/sympy,jerli/sympy,aktech/sympy,Mitchkoens/sympy,jamesblunt/sympy,skirpichev/omg,emon10005/sympy,kaushik94/sympy,kevalds51/sympy,jbbskinny/sympy,kumarkrishna/sympy,kaushik94/sympy,grevutiu-gabriel/sympy,liangjiaxing/sympy,emon10005/sympy,rahuldan/sympy,Davidjohnwilson/sympy,asm666/sympy,sahmed95/sympy,drufat/sympy,meghana1995/sympy,MridulS/sympy,madan96/sympy,sunny94/temp,abhiii5459/sympy,yashsharan/sympy,oliverlee/sympy,MridulS/sympy,debugger22/sympy,abloomston/sympy,garvitr/sympy,saurabhjn76/sympy,Shaswat27/sympy,madan96/sympy,sahmed95/sympy,oliverlee/sympy,beni55/sympy,cswiercz/sympy,lindsayad/sympy,farhaanbukhsh/sympy,abhiii5459/sympy,ChristinaZografou/sympy,MridulS/sympy,diofant/diofant,iamutkarshtiwari/sympy,asm666/sympy,wyom/sympy