Update submodules: parser (new commits)

parser:
    f1adab8 Chris Smith <chris@dmdirc.com>
            Remove external usages of prefix mode bitmaps.

            Prefix modes are now stored as a string, with the most important
            mode at the start (e.g. "ohv").

            Gerrit: http://gerrit.dmdirc.com/3954

Change-Id: Ieca904855e7a98c8c4bc3cf8964bc426400f8058