Use ui_text_submit to confirm and close text prompts

Fix press space when enter editor layout name will
confirm and save layout, same in theme editor

(cherry picked from commit ba4191096792d52c0b7fb5b33524678de0e4b260)

editor/editor_layouts_dialog.cpp

@@ -42,7 +42,7 @@ void EditorLayoutsDialog::_line_gui_input(const Ref<InputEvent> &p_event) {
 	Ref<InputEventKey> k = p_event;
 
 	if (k.is_valid()) {
-		if (k->is_action_pressed(SNAME("ui_accept"), false, true)) {
+		if (k->is_action_pressed(SNAME("ui_text_submit"), false, true)) {
 			if (get_hide_on_ok()) {
 				hide();
 			}

editor/plugins/theme_editor_plugin.cpp

@@ -1834,7 +1834,7 @@ void ThemeItemEditorDialog::_edit_theme_item_gui_input(const Ref<InputEvent> &p_
 			return;
 		}
 
-		if (k->is_action_pressed(SNAME("ui_accept"), false, true)) {
+		if (k->is_action_pressed(SNAME("ui_text_submit"), false, true)) {
 			_confirm_edit_theme_item();
 			edit_theme_item_dialog->hide();
 			edit_theme_item_dialog->set_input_as_handled();