example: remove unneeded media-loading attr

[luwes]

this attribute is unneeded as far as I can tell. it will be propagated by the waiting event

media-chrome/src/js/media-controller.js

Lines 504 to 507 in 9028129

	'waiting,playing,emptied': () => {
	const isLoading = this.media?.readyState < 3;
	this.propagateMediaState(MediaUIAttributes.MEDIA_LOADING, isLoading);
	},

[vercel]

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[codecov]

Codecov Report

Merging #498 (f6de6a4) into main (56b549c) will not change coverage.
The diff coverage is n/a.

❗ Current head f6de6a4 differs from pull request most recent head 28ad22c. Consider uploading reports for the commit 28ad22c to get more accurate results

@@           Coverage Diff           @@
##             main     #498   +/-   ##
=======================================
  Coverage   75.19%   75.19%           
=======================================
  Files          43       43           
  Lines        6870     6870           
=======================================
  Hits         5166     5166           
  Misses       1704     1704           

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[luwes]

going w/ bias for action here and merge. only touches examples and we don't use this attribute in Mux player. very sure this attribute is not needed.