trezor-bridge: mark as broken

Cool, a bitcoin wallet app silently changes its hash.

CC maintainer @ehmry

pkgs/applications/networking/browsers/mozilla-plugins/trezor/default.nix

···
       homepage = https://mytrezor.com;
       license = licenses.unfree;
       maintainers = with maintainers; [ ehmry ];
+      # Download URL, .deb content & hash (yikes) changed, not version.
+      # New archive doesn't contain any Mozilla plugin at all.
+      broken = true;
     };
 
 }