Update Qvitter submodule

diff --git a/plugins/Qvitter b/plugins/Qvitter
index 28c146d44855c8d51bd2b91e137fd79cc07ec932..ef3af7fe8dc13671f75f46b393d509ac40f4a80f 160000 (submodule)
--- a/plugins/Qvitter
+++ b/plugins/Qvitter
@@ -1 +1 @@
-Subproject commit 28c146d44855c8d51bd2b91e137fd79cc07ec932
+Subproject commit ef3af7fe8dc13671f75f46b393d509ac40f4a80f