readme: Update example code

This is just an example, there's no need to strictly match the
original file, and it's confusing Codespell. Just remove the
offending line, and the obsoleted DConf lines.

README.md

@@ -113,11 +113,7 @@ In the example below, the manifest is located at `/build-aux/flatpak/org.gnome.z
         "--share=ipc",
         "--device=dri",
         "--socket=fallback-x11",
-        "--socket=wayland",
-        "--filesystem=xdg-run/dconf",
-        "--filesystem=~/.config/dconf:ro",
-        "--talk-name=ca.desrt.dconf",
-        "--env=DCONF_USER_CONFIG_DIR=.config/dconf"
+        "--socket=wayland"
     ],
     "modules" : [
         {