Disable range-select in menu and suggestions view

We don't need it there so no need to enable it.

I'm leaving the disabled reason checks there, even though they're now redundant,
because they're only one-liners and they communicate intent.

pkg/gui/context/list_context_trait.go

@@ -118,3 +118,8 @@ func (self *ListContextTrait) IsItemVisible(item types.HasUrn) bool {
 	}
 	return false
 }
+
+// By default, list contexts supporta range select
+func (self *ListContextTrait) RangeSelectEnabled() bool {
+	return true
+}