Fix default thumbnail normalization command #635

Job	Run time
Test aip-encrypt on Firefox	19m 30s
Test aip-encrypt on Chrome	19m 54s
Test aip-encrypt-mirror on Firefox	14m 18s
Test aip-encrypt-mirror on Chrome	12m 55s
Test black-box on Chrome	29m 45s
Test icc on Firefox	14m 21s
Test icc on Chrome	14m 0s
Test ipc preservation on Firefox	18m 21s
Test ipc preservation on Chrome	17m 58s
Test ipc access on Firefox	18m 51s
Test ipc access on Chrome	17m 36s
Test metadata-xml on Firefox	19m 58s
Test metadata-xml on Chrome	19m 33s
Test tcc on Firefox	14m 2s
Test tcc on Chrome	13m 54s
Test tpc on Firefox	14m 10s
Test tpc on Chrome	14m 2s
Test uuids-dirs on Firefox	13m 27s
Test uuids-dirs on Chrome	14m 14s
	5h 20m 49s

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