[BUGFIX] No positions in new content element wizard

Issue: Click inside the WEB module on List -> "Create new record" -> "Click here for wizard!". At "2: Select position:" there will be no positions to select from.

This issue is caused by an incompatible TS array. In sysext/backend/Classes/Tree/View/PagePositionMap.php colCount and rowCount are expected inside config__.backend_layout but are direclty under config__.

This issue is fixed by moving colCount and rowCount inside config__.backend_layout.