Default SSKeychainQuerySynchronizationMode to Any

`SSKeychain` class methods do not work with synced passwords.

Create a keychain item with a synced password. Now invoke `SSKeychain`
class methods like `deletePasswordForService:account:` or
`accountsForService:`. They will fail because the `SSKeychainQuery`
object they initialize internally uses the
`SSKeychainQuerySynchronizationModeNo` default.

Defaulting to `SSKeychainQuerySynchronizationModeAny` ensures the
queries created by `SSKeychain` class methods will still match as
expected.