Disable TLS compression for s2s by default

TLS compression is not recommended, and it's already disabled by default
for c2s connections and for ejabberd_http.

src/ejabberd_s2s_in.erl

@@ -325,7 +325,7 @@ wait_for_feature_request({xmlstreamelement, El},
                            {s2s_tls_compression, StateData#state.server},
                            fun(true) -> true;
                               (false) -> false
-                           end, true) of
+                           end, false) of
                         true -> lists:delete(compression_none, TLSOpts1);
                         false -> [compression_none | TLSOpts1]
                     end,

src/ejabberd_s2s_out.erl

@@ -192,7 +192,7 @@ init([From, Server, Type]) ->
                      {s2s_tls_compression, From},
                      fun(true) -> true;
                         (false) -> false
-                     end, true) of
+                     end, false) of
                   false -> [compression_none | TLSOpts4];
                   true -> TLSOpts4
               end,