Fix Logging plugin for new ReverseFileReader.

Depends-On: I921a395e088846216650d1ac14207cb915a6bb8c
Change-Id: If51c7d7214b560c656250f6157a5dc2d2a15894d
Reviewed-on: http://gerrit.dmdirc.com/4046
Automatic-Compile: DMDirc Build Manager
Reviewed-by: Chris Smith <chris@dmdirc.com>