Fix silly typo that causes Schedule buttons to be shown on releases history pages.
Fix silly typo that causes Schedule buttons to be shown on releases history pages.

testbhearsum/balrog,mozbhearsum/balrog,mozbhearsum/balrog,testbhearsum/balrog,mozbhearsum/balrog,mozbhearsum/balrog,testbhearsum/balrog,testbhearsum/balrog