/ gravity upd for multiple screens

gravity, used for placing overlay image, is updated

dots/bin/i3lock_fk.sh

@@ -11,9 +11,11 @@ random_image_filname="$(basename -- $random_image)"
 # get random gravity to use for the overlay image, take the number of displays into account
 numberOfDisplays=$(xrandr --query | grep -o " connected " | wc -l)
 gravity=("center") # "center" "northwest" "northeast" "southwest" "southeast"
-if [[ numberOfDisplays == 1 ]] ; then
+if [[ numberOfDisplays == 1 ]] || [[ numberOfDisplays == 3 ]] ; then
     gravity=("center" "northwest" "northeast" "southwest" "southeast")
-elif [[ numberOfDisplays == 2 ]] ; then
+elif [[ numberOfDisplays == 2 ]] || [[ numberOfDisplays == 4 ]] ; then
+    gravity=("northeast" "southeast")
+else
     gravity=("northeast" "southeast")
 fi
 random_gravity=${gravity[ $RANDOM % ${#gravity[@]} ]}