[BUGFIX] Old EM: t3lib_DB::exec_INSERTquery errors

storeXMLResult() fails to filter non-existing database fields and
tries to insert all fields which it parses from the XML. Solution
is to use a default record structure to only use existing column names.

Change-Id: I80ca3170c2840b44497398b2b9cf48c285dc2215
Fixes: #28637
Releases: 4.5, 4.6
Reviewed-on: http://review.typo3.org/4169
Reviewed-by: Rens Admiraal
Reviewed-by: Stefan Neufeind
Reviewed-by: Xavier Perseguers
Tested-by: Xavier Perseguers