[web/views] Fix AutoformSectionRelationTags.set_muledit_editable
It is a method call, so `self` is passed implicitely as first
argument, so it is useless to pass it also explicitely as second
argument. In fact, it does not work without this. A monkey patch
had been done in a private client's project, but the fix is
revelant for everyone.
### Requirements for tests in various cubicweb/**/test directories. ###
## shared by several test folders
docutils
webtest
## cubicweb/test
Pygments
pycryptodomex
#fyzz XXX pip install fails
## cubicweb/devtools/test
flake8
## cubicweb/hooks/test
psycopg2-binary
## cubicweb/pyramid/test
pyramid >= 1.5.0
waitress >= 0.8.9
wsgicors >= 0.3
pyramid_multiauth
repoze.lru
## cubicweb/sobject/test