format code style: func restore_instance in taskmanager/api.py
format code style: func restore_instance in taskmanager/api.py

CMSS-BCRDB/RDSV1.0,CMSS-BCRDB/RDSV1.0,CMSS-BCRDB/RDS,CMSS-BCRDB/RDS,CMSS-BCRDB/RDS,CMSS-BCRDB/RDSV1.0