Merge pull request #1842 from nextcloud/add/manual_cancellation_result_code

add: manual cancellation result code

Author: AndyScherzinger

library/src/main/java/com/owncloud/android/lib/common/operations/RemoteOperationResult.java

@@ -137,7 +137,10 @@ public enum ResultCode {
         FOLDER_ALREADY_EXISTS,
         CANNOT_CREATE_FILE,
         LOCKED,
-        SIGNING_TOS_NEEDED
+        SIGNING_TOS_NEEDED,
+
+        // Cancelled by user
+        USER_CANCELLED
     }
 
     private boolean mSuccess = false;