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

[castrojo]

Summary

• Move the Blur my Shell popup default to a system-wide GSettings override
• Remove the per-user dconf write from the theming setup hook

Testing

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

[codacy-production]

Up to standards ✅

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[Copilot]

Pull request overview

This PR aims to make the Blur My Shell popup blur default a system-wide setting by switching from a per-user dconf write in the theming user-setup hook to a GSettings schema override under /usr/share/glib-2.0/schemas.

Changes:

• Removed the per-user dconf write that disabled Blur My Shell popup blur in 10-theming.sh.
• Added a new *.gschema.override file to set org.gnome.shell.extensions.blur-my-shell.popup:blur=false by default.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
system_files/shared/usr/share/ublue-os/user-setup.hooks.d/10-theming.sh	Removes per-user dconf modification for Blur My Shell popup blur.
system_files/shared/usr/share/glib-2.0/schemas/zz1-bluefin-extensions.gschema.override	Adds a global GSettings override intended to disable Blur My Shell popup blur by default.

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[castrojo]

For reviewers, the projectbluefin/common repo has moved on so we need to patch it here before migration.