remove more unused imports

packages/excalidraw/element/bounds.ts

@@ -21,7 +21,6 @@ import {
 import { rescalePoints } from "../points";
 import { getBoundTextElement, getContainerElement } from "./textElement";
 import { LinearElementEditor } from "./linearElementEditor";
-import { Mutable } from "../utility-types";
 import { ShapeCache } from "../scene/ShapeCache";
 import Scene from "../scene/Scene";