[BUGFIX] Invalid method signature for ext_posMap::onClickInsertRecord()

Invalid method override signature.

Change-Id: Ifb82ee48c8a83c626004cf67e6529f386d8edb40
Fixes: #30061
Releases: 4.6
Reviewed-on: http://review.typo3.org/5087
Reviewed-by: Xavier Perseguers
Tested-by: Xavier Perseguers