logind: use handle_action_to_string where appropriate

Since 138224fc80, HandleActionData
records the corresponding HandleAction. Let's use it instead of
relying on inhibit_what when mapping to string.

src/login/logind-action.c

@@ -209,8 +209,8 @@ static int handle_action_execute(
 
         if (m->delayed_action)
                 return log_debug_errno(SYNTHETIC_ERRNO(EALREADY),
-                                       "Action already in progress (%s), ignoring requested %s operation.",
-                                       inhibit_what_to_string(m->delayed_action->inhibit_what),
+                                       "Action %s already in progress, ignoring requested %s operation.",
+                                       handle_action_to_string(m->delayed_action->handle),
                                        handle_action_to_string(handle));
 
         inhibit_operation = ASSERT_PTR(handle_action_lookup(handle))->inhibit_what;

src/login/logind-dbus.c

@@ -4011,7 +4011,7 @@ int match_job_removed(sd_bus_message *message, void *userdata, sd_bus_error *err
 
         if (m->action_job && streq(m->action_job, path)) {
                 assert(m->delayed_action);
-                log_info("Operation '%s' finished.", inhibit_what_to_string(m->delayed_action->inhibit_what));
+                log_info("Operation '%s' finished.", handle_action_to_string(m->delayed_action->handle));
 
                 /* Tell people that they now may take a lock again */
                 (void) send_prepare_for(m, m->delayed_action, false);