cubicweb #5359234 error_handler of CubicWebPublisher should not override req.form['vid'] [validation pending]

The error_handler code doesn't seem to rely on it and it should not hide original request parameters.

prioritynormal
typebug
done in3.20.8
load0.250
load left0.000
closed by#f9b06d03859f don't override req.form['vid'] in the publisher's error_handler
patchdon't override req.form['vid'] in the publisher's error_handler [applied]