slo-controller: fix mid resource calculate formula #8566

Job	Run time
golangci-lint	4m 29s
unit-tests(Check Go modules)	39s
unit-tests(Check manifests)	44s
unit-tests(Check auto-generated codes)	3m 10s
unit-tests(Verify gofmt)	53s
unit-tests(Verify govet)	5m 10s
unit-tests(Run Go build)	3m 45s
unit-tests(Run Go test)	8m 52s
build-and-push (koordlet)	3m 34s
build-and-push (koord-manager)	2m 21s
build-and-push (koord-scheduler)	3m 6s
build-and-push (koord-descheduler)	2m 53s
	39m 36s

Provide feedback