Make the "View" menu in 3D view toolbar stay open when selecting a checkbox

This pull request fixes an issue where the "View" menu in the 3D view toolbar would close when you selected either the "View Origin" or "View Grid" checkboxes. This was inconvenient and wasted time by making you have to reopen the menu in order to get to other settings anytime you changed this.

(cherry picked from commit 3ffd75107d140046112a2e83bf7bce662d5a39b7)

editor/plugins/spatial_editor_plugin.cpp

@@ -6408,7 +6408,9 @@ SpatialEditor::SpatialEditor(EditorNode *p_editor) {
 	hbc_menu->add_child(context_menu_container);
 	_update_context_menu_stylebox();
 
+	// Get the view menu popup and have it stay open when a checkable item is selected
 	p = view_menu->get_popup();
+	p->set_hide_on_checkable_item_selection(false);
 
 	accept = memnew(AcceptDialog);
 	editor->get_gui_base()->add_child(accept);