SEBA-420 remove superfluous xproto options

Change-Id: I3bfd98d1cb4e8241f8e455ba0985743b3df4d394
diff --git a/Dockerfile.synchronizer b/Dockerfile.synchronizer
index ee84885..9eef086 100644
--- a/Dockerfile.synchronizer
+++ b/Dockerfile.synchronizer
@@ -15,7 +15,7 @@
 # docker build -t xosproject/fabric-synchronizer:candidate -f Dockerfile.synchronizer .
 
 # xosproject/fabric-synchronizer
-FROM xosproject/xos-synchronizer-base:2.2.5
+FROM xosproject/xos-synchronizer-base:2.2.18
 
 COPY xos/synchronizer /opt/xos/synchronizers/fabric
 COPY VERSION /opt/xos/synchronizers/fabric/