[BUGFIX] Avoid text selection when dragging tree nodes

The drag&drop issue reported in #103877 also affects the icons in the
page tree, which was not fixed back then. This commit now takes care of
the page tree icons as well.

Resolves: #104033
Related: #103877
Releases: 12.4, 11.5
Change-Id: I92381a07bfba2d90d7fc1a85097c54f0d4a7b282
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/84594


Reviewed-by: Benjamin Franzke <ben@bnf.dev>
Tested-by: Oliver Hader <oliver.hader@typo3.org>
Tested-by: Benjamin Franzke <ben@bnf.dev>
Reviewed-by: Oliver Hader <oliver.hader@typo3.org>
Tested-by: core-ci <typo3@b13.com>