gedit doesn't have a settings menu when forwarded in SSH session

[Karl-Philipp Richter]

This might be related to SSH server using `gnome-shell` and client using `unity` desktop which is a weird use case, but still shouldn't happen and worked well before.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: gedit 3.18.3-0ubuntu4
Uname: Linux 4.5.0-040500-generic x86_64
ApportVersion: 2.20-0ubuntu3
Architecture: amd64
Date: Thu Mar 31 20:22:54 2016
InstallationDate: Installed on 2015-04-20 (346 days ago)
InstallationMedia: Ubuntu-Server 14.10 "Utopic Unicorn" - Release amd64 (20141022.2)
ProcEnviron:
 TERM=screen.xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=de_DE.UTF-8
 SHELL=/bin/bash
SourcePackage: gedit
UpgradeStatus: Upgraded to xenial on 2016-03-03 (27 days ago)