Fix the cmdpal moving the infobar down (#11670)

Just read the code, it's immediately obvious what I messed up

Closes #11645

@DHowett turns out I was wrong, I could get this one done before 5 😜

(cherry picked from commit 3667678)

src/cascadia/TerminalApp/TerminalPage.xaml

@@ -153,7 +153,7 @@
         </ContentDialog>
 
         <local:CommandPalette x:Name="CommandPalette"
-                              Grid.Row="1"
+                              Grid.Row="2"
                               VerticalAlignment="Stretch"
                               PreviewKeyDown="_KeyDownHandler"
                               Visibility="Collapsed" />