*.sh: Fix some shellcheck issues

.config/i3/monitor-setup.sh

@@ -1,6 +1,6 @@
 #!/bin/sh
 
-if [ 1 -lt "$(xrandr -q | grep " connected" | wc -l)" ]; then
+if [ 1 -lt "$(xrandr -q | grep -c " connected")" ]; then
 	# scale second monitor to 3200x1800 and put to the left
 	xrandr --output eDP1 --auto --pos 0x0 --primary \
 	       --output DP1 --auto --scale-from 3200x1800 --pos 3200x0 \