[BUGFIX] Add possibility to export "Choice - Image rating" answers

In pbsurvey a new question type has been added, called "Choice - Image rating".

This patch adds the export capabilities for this new question type.

Fixes: #53837

git-svn-id: https://svn.typo3.org/TYPO3v4/Extensions/pbsurveyexport/trunk@81676 735d13b6-9817-0410-8766-e36946ffe9aa