Fix make_universal.py not taking into account 64-bit bundle dylibs

[claucambra]

[nextcloud-desktop-bot]

AppImage file: nextcloud-PR-7027-d82c342d7e0639cd6092de6a160d41bfc6ae786b-x86_64.AppImage

To test this change/fix you can simply download above AppImage file and test it.

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[sonarqubecloud[bot]]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[claucambra]

/backport to stable-3.14

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