systemctl: no need to pass --all if inactive is explicitly requested in list-units

If list-units command is explicitly asked to show inactive units
by using '--state=inactive' option, there's no need to force the user
to pass '--all' option to include inactive units in the search in
this case.

src/systemctl/systemctl.c

@@ -340,6 +340,11 @@ static bool output_show_unit(const UnitInfo *u, char **patterns) {
         if (arg_all)
                 return true;
 
+        if (!strv_isempty(arg_states))
+                return true;
+
+        /* By default show all units except the ones in inactive
+         * state and with no pending job */
         if (u->job_id > 0)
                 return true;