Fix ajax scheduler highlighting for single-block lunches #3239
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Previously, if you had a single lunch on a particular day, the scheduler would show this timeblock as available for single-block sections. However, if you tried to schedule one of these sections in this timeblock, it would just fail silently. I realized this is actually because we weren't doing any lunch constraint checks for single-block classes, which I've fixed. Now, if there is a single lunch block, it is marked as available but not schedulable (green with slanted grey lines) for single-block sections, as should be desired.
Fixes #3236.