[BUGFIX] use search word(s) for ordering search results (again)

There has been a regression in http://review.typo3.org/6657 which
removes correlation between searched words and ordering of search
results. Therefore the ordering of search results had nothing to do
with the search term anymore. This is fixed hereby by using the code
parts from prior versions.

Resolves: #38767
Releases: 6.2, 6.1, 6.0, 4.7
Change-Id: I9cfaceaeede38456dd7622085879c1bd0648be85
Reviewed-on: https://review.typo3.org/20294
Reviewed-by: Oliver Hader
Tested-by: Oliver Hader
Reviewed-by: Wouter Wolters
Reviewed-by: Markus Klein
Tested-by: Markus Klein