[Editor] Fix `AnimationTrackEditor::timeline_changed` signal

Signal was declared with two arguments, emitted with both two and three

editor/animation_track_editor.cpp

@@ -6102,7 +6102,7 @@ void AnimationTrackEditor::goto_prev_step(bool p_from_mouse_event) {
 		pos = 0;
 	}
 	set_anim_pos(pos);
-	emit_signal(SNAME("timeline_changed"), pos, false);
+	_timeline_changed(pos, false);
 }
 
 void AnimationTrackEditor::goto_next_step(bool p_from_mouse_event, bool p_timeline_only) {
@@ -6129,7 +6129,7 @@ void AnimationTrackEditor::goto_next_step(bool p_from_mouse_event, bool p_timeli
 	}
 	set_anim_pos(pos);
 
-	emit_signal(SNAME("timeline_changed"), pos, p_timeline_only);
+	_timeline_changed(pos, p_timeline_only);
 }
 
 void AnimationTrackEditor::_edit_menu_pressed(int p_option) {
@@ -7101,7 +7101,7 @@ void AnimationTrackEditor::_bind_methods() {
 
 	ClassDB::bind_method(D_METHOD("_bezier_track_set_key_handle_mode", "animation", "track_idx", "key_idx", "key_handle_mode", "key_handle_set_mode"), &AnimationTrackEditor::_bezier_track_set_key_handle_mode, DEFVAL(Animation::HANDLE_SET_MODE_NONE));
 
-	ADD_SIGNAL(MethodInfo("timeline_changed", PropertyInfo(Variant::FLOAT, "position"), PropertyInfo(Variant::BOOL, "timeline_only")));
+	ADD_SIGNAL(MethodInfo("timeline_changed", PropertyInfo(Variant::FLOAT, "position"), PropertyInfo(Variant::BOOL, "timeline_only"), PropertyInfo(Variant::BOOL, "update_position_only")));
 	ADD_SIGNAL(MethodInfo("keying_changed"));
 	ADD_SIGNAL(MethodInfo("animation_len_changed", PropertyInfo(Variant::FLOAT, "len")));
 	ADD_SIGNAL(MethodInfo("animation_step_changed", PropertyInfo(Variant::FLOAT, "step")));

editor/plugins/animation_player_editor_plugin.cpp

@@ -2089,7 +2089,7 @@ AnimationPlayerEditor::AnimationPlayerEditor(AnimationPlayerEditorPlugin *p_plug
 
 	add_child(track_editor);
 	track_editor->set_v_size_flags(SIZE_EXPAND_FILL);
-	track_editor->connect(SNAME("timeline_changed"), callable_mp(this, &AnimationPlayerEditor::_animation_key_editor_seek).bind(false));
+	track_editor->connect(SNAME("timeline_changed"), callable_mp(this, &AnimationPlayerEditor::_animation_key_editor_seek));
 	track_editor->connect(SNAME("animation_len_changed"), callable_mp(this, &AnimationPlayerEditor::_animation_key_editor_anim_len_changed));
 
 	_update_player();