[4.0] Favicons fixes

[dgrammatiko]

Pull Request for Issue #31508 .

Summary of Changes

Remove the hardcoded favicon from the templates manifests (atum + cassiopeia)

Testing Instructions

Try to copy a template

Actual result BEFORE applying this Pull Request

Missing favicon

Expected result AFTER applying this Pull Request

All good, you successfully cloned the template

Documentation Changes Required

A bit of documentation about the favicons:

• The actual files are in media/system/images
• Can be overridden by copying these files to templates\templateName\images\favicon**.(svg|ico)
• Any updates will not affect your overrides (a popular question in the forum)

Things to note about the svg files:

• the contents of the joomla-favicon can be replaced with any valid svg (the viewBox can be anything user defined)
• the contents of the joomla-favicon-pinned can be replaced with any valid svg BUT the viewBox needs to remain viewBox="0 0 16 16"
• The classic favicon.ico can be either 16x16 or 32x32

[ceford]

I have tested this item ✅ successfully on 7bbf37f

Applied patch and copied both templates successfully. Reviewed code too. Thanks for attending to this so promptly.

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[ghost]

I have tested this item ✅ successfully on 7bbf37f

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_{This comment was created with the J!Tracker Application at issues.joomla.org/tracker/joomla-cms/31512.}

[alikon]

RTC

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_{This comment was created with the J!Tracker Application at issues.joomla.org/tracker/joomla-cms/31512.}

[richard67]

System test failure in Drone seems not to be related to this PR. It seems to be a problem with our testing environment.

[laoneo]

Thanks!