Fix "vertical" property of StyleBoxLine

scene/resources/style_box.cpp

@@ -482,7 +482,7 @@ void StyleBoxLine::_bind_methods() {
 
 	ADD_PROPERTY(PropertyInfo(Variant::COLOR, "color"), "set_color", "get_color");
 	ADD_PROPERTY(PropertyInfo(Variant::INT, "thickness", PROPERTY_HINT_RANGE, "0,10"), "set_thickness", "get_thickness");
-	ADD_PROPERTY(PropertyInfo(Variant::BOOL, "vertical"), "set_vertical", "get_vertical");
+	ADD_PROPERTY(PropertyInfo(Variant::BOOL, "vertical"), "set_vertical", "is_vertical");
 }
 float StyleBoxLine::get_style_margin(Margin p_margin) const {
 	return thickness;