js: Add missing chain-ups in vfuncs

Commit 55b57421d changed signal handlers to the corresponding vfuncs,
but didn't always chain up as necessary. In most places this doesn't
matter, but at the very least the commit broke activating message list
items via the keyboard.

Add all (hopefully) the missing chain-ups to get the expected behavior
back.

https://gitlab.gnome.org/GNOME/gnome-shell/-/issues/2319

js/ui/slider.js

@@ -186,7 +186,7 @@ var Slider = GObject.registerClass({
             this.value = Math.max(0, Math.min(this._value + delta, this._maxValue));
             return Clutter.EVENT_STOP;
         }
-        return Clutter.EVENT_PROPAGATE;
+        return super.vfunc_key_press_event(keyPressEvent);
     }
 
     _moveHandle(absX, _absY) {