[BUGFIX] Suggest wizard: Display record icon

Especially for pages the icon is not shown in the list of suggested
records. This patch switches the icons from background images to sprite
icons.

Change-Id: I5bf19c43b2979608270638895022517384f97bea
Fixes: #40731
Releases: 6.1, 6.0, 4.7, 4.5
Reviewed-on: https://review.typo3.org/20040
Reviewed-by: Stefan Neufeind
Tested-by: Stefan Neufeind
Reviewed-by: Jigal van Hemert
Tested-by: Jigal van Hemert