Use DI in the server list dialog plugin.

Change-Id: I0b6ccc960a4e08d0a7c6afc08a75b89d2b17c125
Reviewed-on: http://gerrit.dmdirc.com/3037
Automatic-Compile: DMDirc Build Manager
Reviewed-by: Greg Holmes <greg@dmdirc.com>
Inject more things.

Change-Id: I0a6ccc960a4e08d0a7c6aac08aa5b89d2b17c125
Reviewed-on: http://gerrit.dmdirc.com/3038
Automatic-Compile: DMDirc Build Manager
Reviewed-by: Greg Holmes <greg@dmdirc.com>