fix(yabai): brighten display if there is only a single display

.config/yabai/yabai.py

@@ -227,6 +227,11 @@ class Yabai(CLIWrapper):
                         better_display.set_brightness(display, 0)
                     else:
                         better_display.set_brightness(display, 1)
+            else:
+                display = displays.pop()
+                if display:
+                    better_display.set_brightness(display, 1)
+
 
     def manage_spaces(self):
         initial_window = self.get_focused_window()