AppCleaner: Fix ACS progress shortly glitching between % and indeterminate #1276

Job	Run time
Build apps (Foss, Debug, app)	4m 47s
Unit tests (Debug, test)	2m 45s
Build apps (Gplay, Debug, app)	5m 3s
Lint vitals (Foss, Beta, app)	4m 51s
Unit tests (Debug, testFoss)	4m 57s
Lint vitals (Foss, Release, app)	4m 48s
Unit tests (Debug, testGplay)	4m 58s
Unit tests (Beta, test)	2m 40s
Lint vitals (Gplay, Beta, app)	5m 0s
Unit tests (Beta, testFoss)	4m 58s
Lint vitals (Gplay, Release, app)	5m 2s
Unit tests (Beta, testGplay)	5m 12s
Unit tests (Release, test)	2m 51s
Unit tests (Release, testFoss)	5m 2s
Unit tests (Release, testGplay)	4m 49s
	1h 7m 43s

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