slo-controller: fix mid resource calculate formula #8564

Job	Run time
golangci-lint	4m 4s
unit-tests(Check Go modules)	30s
unit-tests(Check manifests)	34s
unit-tests(Check auto-generated codes)	2m 46s
unit-tests(Verify gofmt)	30s
unit-tests(Verify govet)	1m 10s
unit-tests(Run Go build)	1m 22s
unit-tests(Run Go test)	5m 20s
build-and-push (koordlet)	3m 38s
build-and-push (koord-manager)	2m 42s
build-and-push (koord-scheduler)	3m 4s
build-and-push (koord-descheduler)	3m 24s
	29m 4s

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