Fix the activity-item-autoflag message

Judging by the key, I assume that this message is
supposed to say "autoflag".
Otherwise it's identical to articlefeedbackv5-activity-item-flag.
If I'm wrong, feel free to abandon this patch.

Change-Id: I12e61b4d9d6a1695d5006f5dc237d37b50f94c8f
Merge "Fix the activity-item-autoflag message"