Activate triggers when a file is removed in a shared directory

Activate triggers when a file is removed in a shared directory

* src/processarc.c (process_archive): While removing files that
disappeared, move the call to namenodetouse before the test
that skips directory shared with other packages. This is required
because namenodetouse() handles trigger activation and we really
want directories containing (only) removed files to activate the
corresponding triggers.