[CLEANUP] Clarify configuration preset description

The description of the configuration preset in
install tool is a bit misleading which causes people
to confuse this with the Application Context feature.

Remove the mentioning of application context from context preset
and move it to the top.

Releases: 6.2, master
Resolves: #63622
Change-Id: I8acc9032333f0ead6a35c2c7202a07d2668e7c51
Reviewed-on: http://review.typo3.org/35386
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>