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/menu_context.go

@@ -195,3 +195,8 @@ func (self *MenuContext) OnMenuPress(selectedItem *types.MenuItem) error {
 
 	return nil
 }
+
+// There is currently no need to use range-select in a menu so we're disabling it.
+func (self *MenuContext) RangeSelectEnabled() bool {
+	return false
+}