test: fix typo in test_helper.rb #125

Job	Run time
ios_test_with_other_deps	12m 28s
ios_test (test/functional/ios/driver_test.rb,test/functional/ios/patch_test.rb, test1)	15m 25s
android_test (test/functional/android/driver_test.rb,test/functional/android/patch_test.rb,test/f...	10m 2s
ios_test (test/functional/ios/webdriver/create_session_test.rb,test/functional/ios/webdriver/w3c_...	10m 9s
android_test (test/functional/android/driver_test.rb,test/functional/android/patch_test.rb,test/f...	6m 22s
ios_test (test/functional/ios/webdriver/device_test.rb, test3)	9m 55s
android_test (test/functional/android/webdriver/create_session_test.rb,test/functional/android/we...	6m 3s
ios_test (test/functional/ios/ios/device_test.rb, test4)	17m 4s
android_test (test/functional/android/webdriver/create_session_test.rb,test/functional/android/we...	5m 52s
ios_test (test/functional/ios/ios/device_wda_attachment_test.rb,test/functional/ios/ios/search_co...	9m 21s
android_test (test/functional/android/android/mobile_commands_test.rb, uiautomator2, test5)	3m 50s
ios_test (test/functional/ios/ios/image_comparison_test.rb, test6)	8m 31s
ios_test (test/functional/ios/tv_driver_test.rb, test7)	7m 9s
android_test (test/functional/android/android/mobile_commands_test.rb, espresso, test6)	5m 4s
android_test (test/functional/android/android/device_data_test.rb, uiautomator2, test7)	6m 12s
android_test (test/functional/android/android/device_data_test.rb, espresso, test8)	5m 0s
	2h 18m 27s

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