Reading settings needed to be done from the global config to pick
the defaults, writing settings to the user config.

Change-Id: I626284ac3b5a70827d8872edbd488865b959f9c4
Fixes-Issue: CLIENT-457
Reviewed-on: http://gerrit.dmdirc.com/3209
Reviewed-by: Chris Smith <chris@dmdirc.com>
Automatic-Compile: DMDirc Build Manager