Add non-public {Line,Text}Edit::_set_text()

- [Web] Fix "Enter" not triggering LineEdit submits.

Co-authored-by: Marwen Azouzi <marwen.azouzi@datadoghq.com>

scene/main/window.h

@@ -244,7 +244,7 @@ private:
 	friend class Viewport; //friend back, can call the methods below
 
 	void _window_input(const Ref<InputEvent> &p_ev);
-	void _window_input_text(const String &p_text);
+	void _window_input_text(const String &p_text, bool p_emit_signal = false);
 	void _window_drop_files(const Vector<String> &p_files);
 	void _rect_changed_callback(const Rect2i &p_callback);
 	void _event_callback(DisplayServer::WindowEvent p_event);