cubicweb #5729755 typo in DataFeedXMLParser [validation pending]

exitd instead of extid

priorityimportant
typebug
done in3.21.1
load0.100
load left0.000
closed by#1182f5f16a3d [datafeed] fix typo in DataFeedXMLParser.is_deleted (closes #5729755)
patch[datafeed] fix typo in DataFeedXMLParser.is_deleted (closes #5729755) [applied]