[BUGFIX] Fix inline icon rendering of bitmap icons

The existing "inline" rendering for icons causes bitmaps to be
rendered for SVG-inline usage using the <image> tag. This tag
can not be rendered in HTML context.

The backend module menu uses inlined SVGs. Rendering bitmap icons with
SVG-syntax, without an SVG root element, does not work in this context.
(Note: It works in SVG trees because the optional svg container is
removed by SvgTree.js and the image-tag is wrapped into a new <g> element)

We do now wrap "inline" bitmap icons into an svg tag, which will fix
the bitmap module case while the bitmap icons will still
be embeddable into svg groups (<g>) for svg trees.

Resolves: #89558
Related: #89206
Releases: master, 9.5
Change-Id: Ifaec3e697a45ba37b1ee23c0369414ce431cf4e8
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/64325


Tested-by: Markus Klein <markus.klein@typo3.org>
Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Benni Mack <benni@typo3.org>
Reviewed-by: Markus Klein <markus.klein@typo3.org>
Reviewed-by: Frank Nägler <frank.naegler@typo3.org>
Reviewed-by: Benni Mack <benni@typo3.org>