[BUGFIX] indexed_search: use correct TS settings in extbase plugin

[BUGFIX] indexed_search: use correct TS settings in extbase plugin

Fixes few places where controller tried to access TS settings
in the wrong way (with dot at the end of the key).

It also fixes calls not extisting cobj property.

Resolves: #66251
Releases: master, 6.2
Change-Id: I1dba9b7f2b93f7a9eb297f82e067ce6e8e36dbb0
Reviewed-on: http://review.typo3.org/37965
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Reviewed-by: Tymoteusz Motylewski <t.motylewski@gmail.com>
Tested-by: Tymoteusz Motylewski <t.motylewski@gmail.com>