Don't reset state when changing from one selection to another in the …

…editor

This was causing state pollution in the new selection. I can't see why
this needs to happen when a selection changes to another.

This fixes ppy#30839 and also the same
issue happening for the new combo toggle.

Tests all seem to pass, and I can't immediately find anything broken,
but YMMV.

osu.Game/Screens/Edit/Compose/Components/EditorSelectionHandler.cs

@@ -258,6 +258,9 @@ private void createStateBindables()
 
         private void resetTernaryStates()
         {
+            if (SelectedItems.Count > 0)
+                return;
+
             SelectionNewComboState.Value = TernaryState.False;
             AutoSelectionBankEnabled.Value = true;
             SelectionAdditionBanksEnabled.Value = true;