[TASK] Increase spacing between icon (module menu)

Adds small additional space between icons and label in mod menu.

Resolves: #48957
Releses: 6.2
Change-Id: Ibbc0278729ca0aec1bfc56e4c4bd58516c599978
Reviewed-on: https://review.typo3.org/21292
Reviewed-by: Georg Ringer
Tested-by: Georg Ringer