[host] dxgi: enable 24-bit mode by default

General community feedback with this enabled has been positive and we
can now transition to enabling by default.

host/platform/Windows/capture/DXGI/src/dxgi.c

@@ -266,7 +266,7 @@ static void dxgi_initOptions(void)
       .name           = "allowRGB24",
       .description    = "Losslessly pack 32-bit RGBA8 into 24-bit RGB (saves bandwidth)",
       .type           = OPTION_TYPE_BOOL,
-      .value.x_bool   = false
+      .value.x_bool   = true
     },
     {0}
   };