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UEFI doesn't like nomodeset in safe mode

Roland Clobus requested to merge rclobus/live-build:rclobus/modeset_uefi into master

Found when testing with openQA in my local instance:

With QEMU and UEFI SecureBoot active, the safe mode boot entry (the second entry) will not boot properly. It hangs.

The nomodeset kernel option was added in 2010-06-24, which IMO still would make sense for a BIOS-based boot sequence.

I chose to hardcode the removal of nomodeset from the LB_BOOTAPPEND_LIVE_FAILSAFE variable. An alternative solution would be to introduce a new command line option, --bootappend-live-failsafe-bios in addition to the already existing --bootappend-live-failsafe.

--bootappend-live-failsafe would copy its value + nomodeset per default to --bootappend-live-failsafe-bios.

I would however rather avoid yet another command line option.

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