[polybar] Remove bc dependency for package module

Removed dependency on bc to do simple addition.

polybar/.config/polybar/scripts/poly-archupdates

@@ -5,7 +5,7 @@
 # returns empty string when 0 packages are available, so
 # that polybar simply displays nothing.
 #
-# dependendies: yay, bc, (pacman-contrib optional)
+# dependendies: yay, (pacman-contrib optional)
 
 # prefer checkupdates since it allows checking w/o partial upgrade
 if command -v "checkupdates" >/dev/null; then
@@ -21,7 +21,7 @@ updates_aur="$(yay -Qum 2>/dev/null | wc -l)"
 # if ! updates_aur=$(pikaur -Qua 2> /dev/null | wc -l); then
 # if ! updates_aur=$(rua upgrade --printonly 2> /dev/null | wc -l); then
 
-updates="$(echo "$updates_repo + $updates_aur" | bc)"
+updates="$((updates_repo + updates_aur))"
 
 if [ "$updates" -gt 0 ]; then
   echo "$updates"