R4300: Remove obsolete variable; caused crashes in PD/Goldeneye in Android Ed.

Issue pinpointed by xperia64 and discussed in greater length here:
http://www.paulscode.com/forum/index.php?topic=1199.msg11751#msg11751

This may be just a band-aid to a deeper issue.  Was discovered in Android while
trying to reload save states for Perfect Dark and Goldeneye from the latest
master revision of mupen64plus-ae.  Recent changes to mupen64plus-ae have elim-
inated the blanket call to System.exit() it was using previously, which may have
been masking this issue before now.  AE is also different from the upstream PC
version because it loads ui-console dynamically and calls main as a subroutine
of a larger multi-threaded android process (rather than ui-console being an
entry point to a new process). Not sure of all the ramifications, or if this is
even the correct fix, but it does fix the problem in AE.