Fix smart action is not enabled in first whatsapp notification

When there is only one incoming message, whatsapp neither set
category as msg nor use MessageStyle. To fix this, we add one more
heuristic. If a notification has inline reply, we consider it as a
message notification.

BUG: 110527159
Test: Send myself a whatsapp notification. Observe that smart action is
      added.

Change-Id: I2854764dce4eadd4b785d43f3042499607b2e8bf