properly mark read MMS messages too, not just SMS

app/src/main/kotlin/com/simplemobiletools/smsmessenger/activities/ThreadActivity.kt

@@ -251,7 +251,7 @@ class ThreadActivity : SimpleActivity() {
 
             if (!it.read) {
                 hadUnreadItems = true
-                markSMSRead(it.id)
+                markMessageRead(it)
             }
         }
 
@@ -316,6 +316,14 @@ class ThreadActivity : SimpleActivity() {
         showSelectedContacts()
     }
 
+    private fun markMessageRead(message: Message) {
+        if (message.isMMS) {
+            markMMSRead(message.id)
+        } else {
+            markSMSRead(message.id)
+        }
+    }
+
     @Subscribe(threadMode = ThreadMode.ASYNC)
     fun refreshMessages(event: Events.RefreshMessages) {
         messages = getMessages(threadId)