make use of setsid(1)'s -f flag (#652)

Co-authored-by: Luke Smith <luke@lukesmith.xyz>

.local/bin/displayselect

@@ -59,7 +59,7 @@ onescreen() { # If only one output available or chosen.
 postrun() { # Stuff to run to clean up.
 	setbg		# Fix background if screen size/arangement has changed.
 	remaps		# Re-remap keys if keyboard added (for laptop bases)
-	{ killall dunst ; setsid dunst & } >/dev/null 2>&1 # Restart dunst to ensure proper location on screen
+	{ killall dunst ; setsid -f dunst } >/dev/null 2>&1 # Restart dunst to ensure proper location on screen
 	}
 
 # Get all possible displays