Turn off JS obfuscation to work around Firefox problems

For lots of our Firefox users, navigating to a direct change url as

  https://gerrit.wikimedia.org/r/#/c/71281/

(while being logged in) left their Firefox stuck in "Working...".

* The urls work when using dbg=1 url parameter.
* The urls work when being logged out.
* The urls work when using other browsers.
* Users cleared their caches, and logged in/out. Still the same problem.
* No suspicious entries in the gerrit logs.

As forcing obfuscation off, made the problem disappear, we use this
workaround for now.

Change-Id: I86987cbdedd03cec79db257788da31d8681152ff