Fix cleartext signatures internally

OpenKeychain/src/main/java/org/sufficientlysecure/keychain/service/KeychainIntentService.java

@@ -455,6 +455,7 @@ public class KeychainIntentService extends IntentService implements Progressable
                                 this, new ProviderHelper(this), this, inputData, outStream
                         );
                         builder.setEnableAsciiArmorOutput(useAsciiArmor)
+                                .setCleartextSignature(true)
                                 .setVersionHeader(PgpHelper.getVersionForHeader(this))
                                 .setCompressionId(compressionId)
                                 .setSymmetricEncryptionAlgorithm(
@@ -492,9 +493,7 @@ public class KeychainIntentService extends IntentService implements Progressable
                         outStream.close();
 
                         /* Output */
-
                         finalizeEncryptOutputStream(data, resultData, outStream);
-
                     }
 
                     Log.logDebugBundle(resultData, "resultData");