make KeyIdExtractor code more readable

OpenKeychain/src/main/java/org/sufficientlysecure/keychain/provider/KeychainExternalContract.java

@@ -25,6 +25,8 @@ import org.sufficientlysecure.keychain.Constants;
 
 
 public class KeychainExternalContract {
+    public static final int KEY_STATUS_UNVERIFIED = 1;
+    public static final int KEY_STATUS_VERIFIED = 2;
 
     // this is in KeychainExternalContract already, but we want to be double
     // sure this isn't mixed up with the internal one!