update etherpad module

diff --git a/mod/etherpad b/mod/etherpad
index 6e892127767ccaed1c57df4a281d11ad976935ea..9f1b9f8f1ea17db58b76b274e61af3e9427f32e7 160000 (submodule)
--- a/mod/etherpad
+++ b/mod/etherpad
@@ -1 +1 @@
-Subproject commit 6e892127767ccaed1c57df4a281d11ad976935ea
+Subproject commit 9f1b9f8f1ea17db58b76b274e61af3e9427f32e7