river: Do not always restart kanshi with river

Kanshi used to be restarted every time river would be reloaded.
This is not desired however, as restarting river would also
kill the kanshi daemon, and subsequently reload it, reseting
any custom kanshi output layouts or options set.

With this commit kanshi only gets started if it is not already
running through river (i.e. on first boot most of the time).

desktop/.config/river/init

@@ -242,6 +242,9 @@ done
 
 setxkbmap -option "compose:menu"
 
+# start dynamic display configuration
+[ "$(pidof kanshi)" -eq 0 ] || riverctl spawn kanshi
+
 # set a nice wallpaper
 if exist swww; then
     riverctl spawn "swww init"
@@ -258,10 +261,6 @@ fi
 killall waybar
 riverctl spawn waybar
 
-# start dynamic display configuration
-killall kanshi
-riverctl spawn kanshi
-
 # start redshift-like sundown warming using current location or standard values
 killall wlsunset
 loc=$(curl ipinfo.io | grep -e '"loc": ' | sed -e 's/^.*"loc": "\(.*\)",$/\1/')