fix(gnome): use gsettings override for blur-my-shell (#4819)

Co-authored-by: castrojo <castrojo@users.noreply.github.com>
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: castrojo

system_files/shared/usr/share/glib-2.0/schemas/zz1-bluefin-extensions.gschema.override

@@ -0,0 +1,2 @@
+[org.gnome.shell.extensions.blur-my-shell.popup]
+blur=false

system_files/shared/usr/share/ublue-os/user-setup.hooks.d/10-theming.sh

@@ -6,9 +6,6 @@ version-script theming user 1 || exit 0
 
 set -xeuo pipefail
 
-echo 'Disabling Blur my Shell popup blur by default'
-dconf write /org/gnome/shell/extensions/blur-my-shell/popup/blur false
-
 VEN_ID="$(cat /sys/devices/virtual/dmi/id/chassis_vendor)"
 
 if [[ ":Framework:" =~ :$VEN_ID: ]]; then