[pica-db-backup][mongo-run.sh] Don't do verbose logging for 'tar'

pica-db-backup/mongo-run.sh

@@ -37,7 +37,7 @@ echo "=> ${MONGO_SERVICE_NAME}: Backup started: \${BACKUP_NAME}"
 if ${BACKUP_CMD} ;then
     MONGO_BACKUP=$BACKUP_FOLDER\${BACKUP_NAME}
     echo " => Compress files \$MONGO_BACKUP.tar.gz"
-    tar -czvf \$MONGO_BACKUP.tar.gz \$MONGO_BACKUP && \
+    tar -czf \$MONGO_BACKUP.tar.gz \$MONGO_BACKUP && \
     rm -rf \$MONGO_BACKUP && \
     echo "${MONGO_SERVICE_NAME}:  Backup succeeded"
 else