Update to the very latest nightly version of BlastEm and restrict home directory access

[techmetx11]

This PR updates the BlastEm's source archive to the very last commit made (as of the time of this PR)

Also, the program has been patched to use the XDG Desktop Portal file chooser and enable it by default within the program's settings, which means the program no longer requires read-only access to the user's home directory.

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flatpak install --user https://dl.flathub.org/build-repo/252070/com.retrodev.blastem.flatpakref

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⚠️ Linter warnings:

Warnings can be promoted to errors in the future. Please try to resolve them.

• 'appstream-missing-vcs-browser-url' warning found in linter repo check. Details: Please consider adding a vcs-browser URL to the Metainfo file

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flatpak install --user https://dl.flathub.org/build-repo/252194/com.retrodev.blastem.flatpakref

Built for x86_64 architecture.

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✅ Test build succeeded. To test this build, install it from the testing repository:

flatpak install --user https://dl.flathub.org/build-repo/252240/com.retrodev.blastem.flatpakref

Built for x86_64 architecture.

[techmetx11]

CC @hadess