Fixed a typo in line 2481 in evolv2.f, from eq.1 to eq.0. (#623)

Co-authored-by: Shi Ye <shiye2015@u.northwestern.edu>

Author: claireshiye

cosmic/src/evolv2.f

@@ -2478,7 +2478,7 @@ SUBROUTINE evolv2(kstar,mass,tb,ecc,z,tphysf,
 *           dm2 = MIN(dme*taum/tb,dm1)
             if(wd_mass_lim.eq.1)then
                dm2 = MIN(dme*taum/tb,dm1)
-            elseif(wd_mass_lim.eq.1)then
+            elseif(wd_mass_lim.eq.0)then
                dm2 = dm1
             endif
             if(dm2.lt.dm1) supedd = .true.