Fix Failing Keychain Tests

[winsmith]

The following tests fail on CI and have been disabled:

Failing tests:
	ClientTests:
		ProfileTest.testNewProfileClearsExistingAuthenticationInfo()
		TestBookmarks.testNewProfileClearsExistingAuthenticationInfo()
		TestFavicons.testNewProfileClearsExistingAuthenticationInfo()
		TestHistory.testNewProfileClearsExistingAuthenticationInfo()
	SharedTests:
		AuthenticationKeychainInfoTests.testEncodingAndDecoding()
		AuthenticationKeychainInfoTests.testNilIntervalsArentZero()

Investigate the reason behind the failure and fix it. Most likely a signing + keychain thing

re #63