Try to fix Snap.

Thanks to xet7 !

snap-src/bin/mongodb-control

@@ -52,14 +52,14 @@ if [ -z "$MONGO_URL" ]; then
     ## OLD: Logging to file.
     #mongod --dbpath $SNAP_COMMON --logpath $SNAP_COMMON/mongodb.log --logappend --journal $BIND_OPTIONS --smallfiles
     ## NEW: Logging to syslog, that usually has already log rotation.
-    mongod --dbpath $SNAP_COMMON --syslog --journal $BIND_OPTIONS --smallfiles --quiet
+    mongod --dbpath $SNAP_COMMON --syslog --journal $BIND_OPTIONS --quiet
 
 else
 
     ## OLD: Logging to file.
     #mongod --dbpath $SNAP_COMMON --logpath $SNAP_COMMON/mongodb.log --logappend --journal $MONGO_URL --smallfiles
     ## NEW: Logging to syslog, that usually has already log rotation.
-    mongod --dbpath $SNAP_COMMON --syslog --journal $MONGO_URL --smallfiles --quiet
+    mongod --dbpath $SNAP_COMMON --syslog --journal $MONGO_URL --quiet
 
 fi