.config/sway: swaylock: Avoid syntax error when display unplugged

Notes:

 - `*_output_name` macro vars expand only when the display is connected
 - This is due to subshell expansion & parsing caveats introduced by 045074d
 - Caused by: Workaround hack for issue that will be fixed by swaywm/swaylock#368

Author: trinitronx

dot_config/sway/definitions.d/02-override-swaylock.conf

@@ -6,7 +6,9 @@
 ### Lockscreen configuration
 # Set long options in config file: ~/.config/swaylock/config
 # Otherwise, we get segfault from swayidle PID
-set $locking swaylock --daemonize --image "$pikvm_output_name:/usr/share/backgrounds/sway/Sway_Wallpaper_Blue_1920x1080.png" --image "$vizio_m601d_output_name:/usr/share/backgrounds/wizard4-by-rfk1ll.jpg" --image "$lg_oled_output_name:${XDG_PICTURES_DIR}/backgrounds/oled-pure-black-3840x2160.png"
+## NOTE: *_output_name macro vars expand only when the display is connected!
+#set $locking swaylock --debug --daemonize --image "$pikvm_output_name:/usr/share/backgrounds/sway/Sway_Wallpaper_Blue_1920x1080.png" --image "$vizio_m601d_output_name:/usr/share/backgrounds/wizard4-by-rfk1ll.jpg" --image "$lg_oled_output_name:${XDG_PICTURES_DIR}/backgrounds/oled-pure-black-3840x2160.png"
+set $locking swaylock --daemonize --image $vizio_m601d_output_name:/usr/share/backgrounds/wizard4-by-rfk1ll.jpg --image "$lg_oled_output_name:${XDG_PICTURES_DIR}/backgrounds/oled-pure-black-3840x2160.png"
 
 ### Idle configuration
 # This will lock your screen after 300 seconds of inactivity, then turn off