Fix a test in test_medium
Fix a test in test_medium

In master it behaves as follows:

    In [1]: from sympy.physics.optics import Medium
    In [2]: from sympy.physics.units import c, u0, e0, m, kg, s, A
    In [3]: m5 = Medium('m5', permittivity=710*10**(-12)*s**4*A**2/(m**3*kg), n=1.33)

    In [4]: m5.intrinsic_impedance - 6.24845417765552*kg*m**2/(A**2*s**3)Out[4]:
                            2
    3.5527136788005e-15⋅kg⋅m
    ─────────────────────────
               2  3
              A ⋅s

    In [5]: simplify(_)
    Out[5]: 0

The result [5] is incorrect. In this PR, it behaves identically, except:

    In [5]: simplify(_)
    Out[5]:
                            2
    3.5527136788005e-15⋅kg⋅m
    ─────────────────────────
               2  3
              A ⋅s

Which is correct. We fixed the test to test that the numerical coefficient is
small enough.

We also fixed the other failing tests.

yashsharan/sympy,pandeyadarsh/sympy,Davidjohnwilson/sympy,cswiercz/sympy,mafiya69/sympy,yashsharan/sympy,jaimahajan1997/sympy,Designist/sympy,bukzor/sympy,sahmed95/sympy,Titan-C/sympy,sahmed95/sympy,atsao72/sympy,toolforger/sympy,Designist/sympy,chaffra/sympy,Davidjohnwilson/sympy,asm666/sympy,chaffra/sympy,VaibhavAgarwalVA/sympy,sampadsaha5/sympy,postvakje/sympy,ChristinaZografou/sympy,kaushik94/sympy,pandeyadarsh/sympy,abhiii5459/sympy,bukzor/sympy,mcdaniel67/sympy,Davidjohnwilson/sympy,atreyv/sympy,moble/sympy,hargup/sympy,postvakje/sympy,AkademieOlympia/sympy,Vishluck/sympy,Gadal/sympy,Curious72/sympy,yukoba/sympy,farhaanbukhsh/sympy,MechCoder/sympy,iamutkarshtiwari/sympy,debugger22/sympy,aktech/sympy,lindsayad/sympy,mcdaniel67/sympy,ga7g08/sympy,souravsingh/sympy,ga7g08/sympy,shikil/sympy,VaibhavAgarwalVA/sympy,abloomston/sympy,atreyv/sympy,wanglongqi/sympy,atsao72/sympy,saurabhjn76/sympy,drufat/sympy,farhaanbukhsh/sympy,kevalds51/sympy,kaushik94/sympy,ga7g08/sympy,kevalds51/sympy,MechCoder/sympy,AkademieOlympia/sympy,debugger22/sympy,iamutkarshtiwari/sympy,garvitr/sympy,AkademieOlympia/sympy,Shaswat27/sympy,iamutkarshtiwari/sympy,jerli/sympy,asm666/sympy,Arafatk/sympy,Shaswat27/sympy,abloomston/sympy,wyom/sympy,grevutiu-gabriel/sympy,yashsharan/sympy,kevalds51/sympy,kaushik94/sympy,cswiercz/sympy,pandeyadarsh/sympy,aktech/sympy,ChristinaZografou/sympy,oliverlee/sympy,Arafatk/sympy,atsao72/sympy,VaibhavAgarwalVA/sympy,jbbskinny/sympy,debugger22/sympy,saurabhjn76/sympy,toolforger/sympy,postvakje/sympy,shikil/sympy,kaichogami/sympy,wanglongqi/sympy,moble/sympy,bukzor/sympy,oliverlee/sympy,Curious72/sympy,ChristinaZografou/sympy,Curious72/sympy,garvitr/sympy,chaffra/sympy,moble/sympy,saurabhjn76/sympy,kumarkrishna/sympy,Arafatk/sympy,Titan-C/sympy,drufat/sympy,atreyv/sympy,skidzo/sympy,Vishluck/sympy,skidzo/sympy,sahmed95/sympy,kaichogami/sympy,jaimahajan1997/sympy,maniteja123/sympy,kumarkrishna/sympy,mafiya69/sympy,farhaanbukhsh/sympy,souravsingh/sympy,ahhda/sympy,abhiii5459/sympy,lindsayad/sympy,emon10005/sympy,Designist/sympy,toolforger/sympy,drufat/sympy,MechCoder/sympy,maniteja123/sympy,Gadal/sympy,grevutiu-gabriel/sympy,Titan-C/sympy,abloomston/sympy,grevutiu-gabriel/sympy,Gadal/sympy,cswiercz/sympy,hargup/sympy,jaimahajan1997/sympy,rahuldan/sympy,madan96/sympy,hargup/sympy,madan96/sympy,sampadsaha5/sympy,wyom/sympy,kumarkrishna/sympy,lindsayad/sympy,Shaswat27/sympy,Vishluck/sympy,asm666/sympy,wyom/sympy,jerli/sympy,kaichogami/sympy,emon10005/sympy,garvitr/sympy,sampadsaha5/sympy,ahhda/sympy,jbbskinny/sympy,jerli/sympy,yukoba/sympy,rahuldan/sympy,rahuldan/sympy,yukoba/sympy,shikil/sympy,oliverlee/sympy,emon10005/sympy,jbbskinny/sympy,madan96/sympy,mafiya69/sympy,maniteja123/sympy,ahhda/sympy,abhiii5459/sympy,souravsingh/sympy,mcdaniel67/sympy,wanglongqi/sympy,skidzo/sympy,aktech/sympy