Confirm code completion with numpad key ENTER

(cherry picked from commit e9f9e00bd9ed9c4c34a5d15c219af56c1010763a)

scene/gui/text_edit.cpp

@@ -1768,7 +1768,7 @@ void TextEdit::_input_event(const InputEvent& p_input_event) {
 							return;
 						}
 
-						if (k.scancode==KEY_RETURN || k.scancode==KEY_TAB) {
+						if (k.scancode==KEY_ENTER || k.scancode==KEY_RETURN || k.scancode==KEY_TAB) {
 
 							_confirm_completion();
 							accept_event();