schema: remove frame bg guard flag from runtime

packages/element/src/newElement.ts

@@ -10,7 +10,6 @@ import {
   getFontString,
   getUpdatedTimestamp,
   getLineHeight,
-  isTransparent,
 } from "@excalidraw/common";
 
 import type { Radians } from "@excalidraw/math";
@@ -186,13 +185,11 @@ export const newFrameElement = (
     name?: string;
   } & ElementConstructorOpts,
 ): NonDeleted<ExcalidrawFrameElement> => {
-  const frameBase = _newElementBase<ExcalidrawFrameElement>("frame", opts);
   const frameElement = newElementWith(
     {
-      ...frameBase,
+      ..._newElementBase<ExcalidrawFrameElement>("frame", opts),
       type: "frame",
       name: opts?.name || null,
-      backgroundEnabled: !isTransparent(frameBase.backgroundColor),
     },
     {},
   );