[!!!][BUGFIX] Respect rootLevel -1 for extbase queries

The rootLevel of a table can be configured to 0, 1 or -1.
Currently only 0 and 1 are respected by the Typo3DbQueryParser
when building the pageId statement. This patch streamlines
the statement building to work for -1 settings as well.

Change-Id: Ide900548ef90ea0f933f33640757b1cb20e8767e
Resolves: #63406
Releases: master
Reviewed-on: http://review.typo3.org/43675


Reviewed-by: Morton Jonuschat <m.jonuschat@mojocode.de>
Tested-by: Morton Jonuschat <m.jonuschat@mojocode.de>
Reviewed-by: Benni Mack <benni@typo3.org>
Tested-by: Benni Mack <benni@typo3.org>