Fix LineEdit not consuming enter events

LineEdit should not return early when processing KEY_ENTER, so it can
consume the event properly.

Regression introduced by mistake while fixing enter events for Android
(PR #40487 - c0b394572f35498801571ad7176eb357d5de1bf3)

(cherry picked from commit 5c63dec36e21c9f7a8b615a58e2bddacafd57778)

scene/gui/line_edit.cpp

@@ -326,7 +326,6 @@ void LineEdit::_gui_input(Ref<InputEvent> p_event) {
 					if (OS::get_singleton()->has_virtual_keyboard() && virtual_keyboard_enabled)
 						OS::get_singleton()->hide_virtual_keyboard();
 
-					return;
 				} break;
 
 				case KEY_BACKSPACE: {