Typo in taxonomy_display_fetch_taxonomy_display()

There is a typo in taxonomy_display_fetch_taxonomy_display() that causes the display options keys to be improperly set to another key ($k . '_dipslay_options' instead of $k . '_display_options').

This has no affect on the content output, however it does generate undefined index errors for vocabularies that do not have any taxonomy display settings saved. I will tag another release that fixes this issue.