Update metalogger.sh

Just fix a typo in word "this" in the error message

Author: kry127

moosefs-metalogger/metalogger.sh

@@ -23,7 +23,7 @@ else
             exec mfsmetalogger -f
         else
             echo "No /var/lib/mfs/metadata.mfs file!"
-            echo "EXITING - THS IS PRODUCTION ENVIRONMENT!"
+            echo "EXITING - THIS IS PRODUCTION ENVIRONMENT!"
             exit 1
         fi
     fi