(bug 44902) Gerrit search bar is too far on the right

Move the top menu bar in Gerrit slightly to the left (by 100px) so it
leaves a bit of space for the extending search bar. The 200px margin is
enough to not overlap the Wikimedia logo.

Change-Id: Idb827c917fbc786753e9c48ca05218457e38aa1c
Merge "(bug 44902) Gerrit search bar is too far on the right" into production