Don't create aliases with command chars in.

The aliases system expects both names and substitutions to
be plain, as it will add the relevant chars itself.

Change-Id: I1dbe301952148937928d3b1867bce499b255cd3c
Reviewed-on: http://gerrit.dmdirc.com/3546
Reviewed-by: Greg Holmes <greg@dmdirc.com>
Automatic-Compile: DMDirc Build Manager