[gnome] Update how we dump dconf

bin/.local/bin/dconf_backup.sh

@@ -0,0 +1,23 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+OUT=gnome/.local/share/custom-gconf.conf
+: >"$OUT"
+
+paths=(
+    /org/gnome/desktop/interface/
+    /org/gnome/desktop/input-sources/
+    /org/gnome/desktop/peripherals/
+    /org/gnome/desktop/privacy/
+    /org/gnome/desktop/session/
+    /org/gnome/desktop/wm/
+    /org/gnome/mutter/
+    /org/gnome/settings-daemon/plugins/
+    /org/gnome/shell/extensions/
+)
+
+for p in "${paths[@]}"; do
+    echo "# $p" >>"$OUT"
+    dconf dump "$p" >>"$OUT"
+    echo >>"$OUT"
+done