Dont assume url

[timkelty]

The rename action assumes that an asset will have a URL, which it might not.
This causes a JS error when trying to rename an asset without URLs.

Instead of extracting the filename from the URL, this PR sets filename data and uses that.

Related:

• cms/src/elements/Asset.php

  Lines 1943 to 1946 in 2c5291f

  	// todo: uncomment for v5. Currently Imager X is relying on a relative URL being returned
  	//if (!$volume->getFs()->hasUrls) {
  	// return null;
  	//}