[Linux] Fix custom keybindings in rofi_systemd

dotfiles/lib/bin/rofi_systemd.sh

@@ -18,13 +18,14 @@ stop="Alt+k"
 restart="Alt+r"
 
 function select_service_and_act {
-    selection=$(rofi -dmenu -i -p "systemd unit: " \
+    result=$(rofi -dmenu -i -p "systemd unit: " \
          -kb-custom-1 "${enable}" \
          -kb-custom-2 "${disable}" \
          -kb-custom-3 "${stop}" \
-         -kb-custom-4 "${restart}" | sed -n 's/ \+/ /gp')
+         -kb-custom-4 "${restart}")
 
     rofi_exit="$?"
+    selection="$(echo $result | sed -n 's/ \+/ /gp')"
 
     action="restart"
     case "$rofi_exit" in