Fixed crash when bin is not found in a bin/cue.

This change make LoadBinCue consistent with others
Load* functions: if it works, it fclose iso_file, if it
fails, it doesn't.

git-svn-id: svn+ssh://svn.code.sf.net/p/yabause/code/trunk@3234 d7be59e3-070e-4b9a-85a1-4646befae34d