mood: Clear the score table on attribute changes.

mood: Clear the score table on attribute changes.

Although the comment in mood.c correctly states that the score table
must be cleared and reloaded if an attribute is added, removed or
renamed, the mood event handler misses to clear the score table.
Therefore, after reload_current_mood() has reloaded the mood object,
insertion of admissible files fails with

	afs_event: table moods, event 0: key already exists in rbtree

This results in an unmodified set of admissible files.

The only other caller of reload_current_mood() clears the score table
right before the function call, so the easiest fix is to move the
call to clear_score_table() into reload_current_mood().