tree-wide: remove unnecessary LOG_PRI

LOG_DEBUG is already a log level, there is no need to use LOG_PRI which
is for filtering out the facility.

src/shared/logs-show.c

@@ -1263,7 +1263,7 @@ int show_journal_by_unit(
         if (r < 0)
                 return r;
 
-        if (_unlikely_(log_get_max_level() >= LOG_PRI(LOG_DEBUG))) {
+        if (_unlikely_(log_get_max_level() >= LOG_DEBUG)) {
                 _cleanup_free_ char *filter;
 
                 filter = journal_make_match_string(j);