[etherpad-web/oscp-backend] Revert "Update to 1.8.5 and install ep_set_title_on_pad"

[Bartłomiej Piotrowski <bpiotrowski src gnome org>]

commit 3305c547b55e83c8a57fea704443a4bcb6435f6f
Author: Bartłomiej Piotrowski <bpiotrowski gnome org>
Date:   Sat Sep 12 19:11:48 2020 +0200

    Revert "Update to 1.8.5 and install ep_set_title_on_pad"
    
    This reverts commit 6e74ef800c9a9646be7bbaca8153f3532e9b795a.

 Dockerfile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/Dockerfile b/Dockerfile
index a993b71..c5f4172 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,6 +1,6 @@
 FROM node:10-buster-slim
 
-ENV ETHERPAD_VERSION 1.8.5
+ENV ETHERPAD_VERSION 1.8.4
 ENV NODE_ENV production
 
 RUN apt-get update && \