Cum bugfix

**Bug:**
The cum stat did not go down upon orgasm.
With debug enabled: JS crashes/produces an error, making it impossible to continue, upon orgasm.

**Cause:**
*"Entity.js"*
The entire "Stat.prototype.DecreaseStat()" function was enclosed in a
"if(ideal)" statement, blocking any return statements if ideal was
false/0.
The function "Entity.prototype.OrgasmCum" relies on the output of
DecreaseStat and as such did not work properly.
Code that relies on the function:
*"cumQ = balls.cum.DecreaseStat(0, cumQ, true);"*

**Notes:**
If I somehow misunderstood your intentions here, please feel free to decline the pull request. If anything, I highlighted a bug.