Update submodules: plugins (new commits)

plugins:
    2327679 Chris Smith <chris@dmdirc.com>
            Tidy up some plugins

            Gerrit: http://gerrit.dmdirc.com/2730

Change-Id: I3ee4780cecafb298d64cb32644b507add3c59c84

modules/plugins

@@ -1 +1 @@
-Subproject commit 81317792d86295cdc5e03f81153b14d3a6c28f43
+Subproject commit 23276790c42b8bc36707b98f2f7a8a8ea0853e53