misc: remove unused imports

wcs/wf/backoffice_fields.py

@@ -14,11 +14,8 @@
 # You should have received a copy of the GNU General Public License
 # along with this program; if not, see <http://www.gnu.org/licenses/>.
 
-import sys
 import xml.etree.ElementTree as ET
 
-from quixote import get_publisher
-
 from qommon import _
 from qommon.form import (WidgetListAsTable, CompositeWidget, SingleSelectWidget,
         ComputedExpressionWidget)