filter-apply: Eliminate nested and redundant hook events

filter-apply: Eliminate nested and redundant hook events

In proces(), the do_move() function calls pa_{sink_input,source_output}_set_property().
This triggers a call to {sink_input,source_output}_proplist_cb() which called process()
a second time.

This patch avoids the duplicate and nested call to process() by checking if
PA_PROP_FILTER_APPLY_MOVING is set in {sink_input,source_output}_proplist_cb().