UI: Fix UpdateWaitWindow.axaml windows being too big on windows (#314)

src/Ryujinx/UI/Controls/UpdateWaitWindow.axaml

@@ -7,6 +7,7 @@
     Title="Ryujinx - Waiting"
     SizeToContent="WidthAndHeight"
     WindowStartupLocation="CenterOwner"
+    CanResize="False"
     mc:Ignorable="d"
     Focusable="True">
     <Grid