Update joplin.subdomain.conf.sample

Co-authored-by: Eric Nemchik <eric@nemchik.com>

Author: Ogloppi

joplin.subdomain.conf.sample

@@ -3,8 +3,8 @@
 # make sure that your dns has a cname set for joplin
 
 server {
-    listen 443 ssl http2;
-    listen [::]:443 ssl http2;
+    listen 443 ssl;
+    listen [::]:443 ssl;
 
     server_name joplin.*;