Fixed source of command not found errors in powermenu

scripts/powermenu

@@ -113,8 +113,8 @@ typeset -A menu
 # Menu with keys/commands
 
 menu=(
-  [ Shutdown]="shutdown now"
-  [ Reboot]="reboot"
+  [ Shutdown]="systemctl poweroff"
+  [ Reboot]="systemctl reboot"
   [ Suspend]="systemctl suspend"
   [ Hibernate]="systemctl hibernate"
   [ Lock]="xflock4"
@@ -171,7 +171,7 @@ function ask_confirmation() {
   fi
 
   if [ "${confirmed}" == 0 ]; then
-    "${menu[${selection}]}"
+    ${menu[${selection}]}
   fi
 }
 
@@ -180,6 +180,6 @@ if [[ $? -eq 0 && ! -z ${selection} ]]; then
         ${menu_confirm} =~ (^|[[:space:]])"${selection}"($|[[:space:]]) ]]; then
     ask_confirmation
   else
-    "${menu[${selection}]}"
+    ${menu[${selection}]}
   fi
 fi