fix(wlr/taskbar): re-show task when it no longer matches ignore-list

The un-ignore branch in hide_if_ignored() computed is_was_ignored
after the enclosing condition already required ignored_ to be false,
so it never ran, and a task whose app_id/title changed away from an
ignore-list entry stayed hidden forever.

Reset ignored_ and show the button again, subject to the same
all-outputs/output-membership check used everywhere else.

src/modules/wlr/taskbar.cpp

@@ -290,14 +290,14 @@ void Task::hide_if_ignored() {
   if (tbar_->ignore_list().count(app_id_) || tbar_->ignore_list().count(title_)) {
     ignored_ = true;
     hide_button();
+    return;
   }
 
-  if (!ignored_ && !squashed_) {
-    bool is_was_ignored = ignored_;
+  if (ignored_) {
+    /* The app_id/title changed to a value that is no longer ignored */
     ignored_ = false;
-    if (is_was_ignored) {
-      auto output = gdk_wayland_monitor_get_wl_output(bar_.output->monitor->gobj());
-      handle_output_enter(output);
+    if (!squashed_ && (tbar_->all_outputs() || on_bar_output_)) {
+      show_button();
     }
   }
 }