Revert to using getTexture in _touchingBounds

Not confident that it does not cause issues as this seems to be the only
thing ensuring that the textures used for collision are actually
up-to-date, and using the 1x zoom specifically is definitely needed for
compatibility with Scratch quirks.

Author: GarboMuffin

src/RenderWebGL.js

@@ -1636,7 +1636,7 @@ class RenderWebGL extends EventEmitter {
         const drawable = this._allDrawables[drawableID];
 
         /** @todo remove this once URL-based skin setting is removed. */
-        if (!drawable.skin || !drawable.skin.isMetricsReady()) return null;
+        if (!drawable.skin || !drawable.skin.getTexture([100, 100])) return null;
 
         const bounds = drawable.getFastBounds();