Attempting to print hangs the Unsafe Browser

Originally created by @kytv on #7771 (Redmine)

Hitting CTRL+P or going to File -> Print in the unsafe-browser will cause the browser window to hang for several minutes while attempting to reach CUPS. Of course, unsafe-browser can’t reach CUPS due to restrictions in ferm.

The soon-to-be-referenced branch solves this problem for me by disabling CUPS within unsafe-browser.

(I would have done this sooner but I just found it while working on the upcoming “I2P Browser”).

Feature Branch: bugfix/7771-disable-cups-in-unsafe-browser

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