Update submodules: plugins (new commits)

plugins:
    c5ba411 Greg Holmes <greg@dmdirc.com>
            Show restart dialog if update dialog is open

            Gerrit: http://gerrit.dmdirc.com/2811

Change-Id: Ie0222ce2bfdfc50c7c3d0a271cb80ea82cfcad43

modules/plugins

@@ -1 +1 @@
-Subproject commit c6ed9e1029e665c6cdf99dc422edb8fd53bea593
+Subproject commit c5ba411153440f011529a28207d3aa5c66f09988