Update submodules: plugins (new commits)

plugins:
    5b5d05a Chris Smith <chris@dmdirc.com>
            More minor tidying.

            Gerrit: http://gerrit.dmdirc.com/3101

Change-Id: I40eadf5eff1c3a0df4cd7859f9ce8067b5923917

modules/plugins

@@ -1 +1 @@
-Subproject commit 0ebc7634abfee73d9928cf14ad1c584b88c21b7a
+Subproject commit 5b5d05a2008835965eec0e38d5955bfa507a4026