Use some more FrameClosingEvents

Change-Id: I36d784d618070bc8c55da1c12682b9434aa0ac25
Depends-On: I58ab2318458c809191919595e1eb011646fe6b0e
Reviewed-on: http://gerrit.dmdirc.com/3812
Automatic-Compile: DMDirc Build Manager
Reviewed-by: Chris Smith <chris@dmdirc.com>