util/log: use bright black rather than black for WLR_DEBUG
Created by: Xyene
On some terminals under default settings, black is truly rendered as
#000, making it unreadable when the background is also black.
Refs swaywm/sway#5141.
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Created by: Xyene
On some terminals under default settings, black is truly rendered as
#000, making it unreadable when the background is also black.
Refs swaywm/sway#5141.