CMIS Versions dialog: fix version date

The version creation date is more likely to be the
cmis:lastModifiedDate.

Change-Id: I15e81db6a4c5f638f3f472894608a8d6728dc2d2

ucb/source/ucp/cmis/cmis_content.cxx

@@ -1089,7 +1089,7 @@ namespace cmis
                 libcmis::DocumentPtr pVersion = *it;
                 aVersions[i].Id = STD_TO_OUSTR( pVersion->getId( ) );
                 aVersions[i].Author = STD_TO_OUSTR( pVersion->getCreatedBy( ) );
-                aVersions[i].TimeStamp = lcl_boostToUnoTime( pVersion->getCreationDate( ) );
+                aVersions[i].TimeStamp = lcl_boostToUnoTime( pVersion->getLastModificationDate( ) );
                 aVersions[i].Comment = STD_TO_OUSTR( pVersion->getStringProperty("cmis:checkinComment") );
             }
             return aVersions;