Add workaround for delegate stuck transition bug

Sometimes and randomly, a HListView/HGridView delegate's
add/populate transition will stop before completion.

This especially happens on startup when loading a large room list,
one room might get stuck and left tiny or invisible, despite its
normal space still being taken.

src/gui/Pages/Chat/Timeline/EventDelegate.qml

@@ -84,6 +84,8 @@ HColumnLayout {
 
     ListView.onRemove: eventList.uncheck(model.id)
 
+    DelegateTransitionFixer {}
+
     Item {
         Layout.fillWidth: true
         visible: model.event_type !== "RoomCreateEvent"