Fixes to CVT3 calcs
Detail: Missing break statements (around line 790) would always have selected 50Hz frame rate regardless. Removed duplicate call to add_proposed_mode() which generate_mode_using_cvt_rb() already does, resulting in duplicated modes. Admin: CVT3 still untested, but less broken than before. Submission for the EDID bounty. Tagged as ScrModes-0_55-cvt3fix.
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