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Fix reset field classification service command.
Example command: "cmd autofill set temporary-detection-service 0". The function needs to call reset the detection service when it finds the service name is null. Similar to reset augmented autofill. Otherwise the getNextIntArgRequired() call would throw error saying the duration is not found in command. bug:271128589 Test: atest PccFieldClassificationTest, check in log if shell command "cmd autofill set temporary-detection-service 0" is correctly parsed. Change-Id: I5937b19e179571567d91808c6f3a74ddc6172815