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sfwbar: fix SVG icon rendering via wrapGAppsHook3
Add `wrapGAppsHook3` to `nativeBuildInputs` to ensure `sfwbar` can successfully locate the `gdk-pixbuf` loaders required to render SVG symbolic icons in default GTK widgets (such as the battery, bluez, and volume modules). The inclusion of this hook automatically generates a unified `loaders.cache` and wraps the resulting binary with the correct `GDK_PIXBUF_MODULE_FILE` environment variable. Furthermore, it automatically handles the population of `XDG_DATA_DIRS`, rendering the previous manual `wrapProgram` execution in `postFixup` redundant.