Update unsupported message UI.

app/src/main/java/org/thoughtcrime/securesms/messagedetails/MessageDetailsFragment.kt

@@ -5,6 +5,7 @@ import android.net.Uri
 import android.os.Bundle
 import android.view.View
 import android.widget.FrameLayout
+import android.widget.Toast
 import androidx.fragment.app.DialogFragment
 import androidx.lifecycle.Observer
 import androidx.lifecycle.ViewModelProvider
@@ -391,6 +392,10 @@ class MessageDetailsFragment : FullScreenDialogFragment(), MessageDetailsAdapter
     Log.w(TAG, "Not yet implemented!", Exception())
   }
 
+  override fun onUpdateSignalClicked() {
+    Toast.makeText(requireContext(), "Can't touch this.", Toast.LENGTH_SHORT).show()
+  }
+
   interface Callback {
     fun onMessageDetailsFragmentDismissed()
   }