I rewrote the code to disable and enable the buttons a while back, I'll add
this code as a fallback safety measure.

Change-Id: Ia6037f25f5222d6bf954d45f6344a0121a2dfca9
Reviewed-on: http://gerrit.dmdirc.com/1127
Automatic-Compile: DMDirc Local Commits <dmdirc@googlemail.com>
Reviewed-by: Chris Smith <chris@dmdirc.com>