use resolved_path for filelist_contains

alpm_filelist_contains was being used to search for resolved paths, but
searching in the unresolved paths, causing it to miss matches.  We
always search unresolved paths and search the resolved paths if
available because _alpm_filelist_resolve is not public and requires
a context handle, so it can't be called from alpm_filelist_contains.

Signed-off-by: Andrew Gregory <andrew.gregory.8@gmail.com>