Fix the issue when set F2> as the default menu item.

INSTALL/grub/grub.cfg

@@ -2321,6 +2321,32 @@ export VTOY_HELP_TXT_LANGUAGE
 export VTOY_CHKSUM_FILE_PATH
 
 
+#colect all image files (iso files)
+set ventoy_img_count=0
+vt_list_img $vtoy_iso_part ventoy_img_count
+
+#Main menu
+if [ $ventoy_img_count -gt 0 ]; then
+    if [ $VTOY_DEFAULT_MENU_MODE -eq 0 ]; then
+        vt_dynamic_menu 0 0 
+    else
+        vt_dynamic_menu 0 1
+    fi
+else
+    if [ -n "$VTOY_NO_ISO_TIP" ]; then
+        NO_ISO_MENU="No ISO files found, $VTOY_NO_ISO_TIP"
+    elif [ -n "$VTOY_DEFAULT_SEARCH_ROOT" ]; then
+        NO_ISO_MENU="No ISO files found, please check VTOY_DEFAULT_SEARCH_ROOT"
+    else
+        NO_ISO_MENU="No ISO files found"
+    fi
+    menuentry "$NO_ISO_MENU (Press enter to reboot ...)" {
+        echo -e "\n    Rebooting ... "
+        reboot
+    }
+fi
+
+
 #special VTOY_DEFAULT_IMAGE process
 if [ -n "$VTOY_DEFAULT_IMAGE" ]; then
     if regexp --set 1:vtHotkey --set 2:vtDefault "(F[2-9])>(.*)" "$VTOY_DEFAULT_IMAGE"; then
@@ -2351,27 +2377,3 @@ if [ -n "$VTOY_DEFAULT_IMAGE" ]; then
     fi    
 fi
 
-#colect all image files (iso files)
-set ventoy_img_count=0
-vt_list_img $vtoy_iso_part ventoy_img_count
-
-#Main menu
-if [ $ventoy_img_count -gt 0 ]; then
-    if [ $VTOY_DEFAULT_MENU_MODE -eq 0 ]; then
-        vt_dynamic_menu 0 0 
-    else
-        vt_dynamic_menu 0 1
-    fi
-else
-    if [ -n "$VTOY_NO_ISO_TIP" ]; then
-        NO_ISO_MENU="No ISO files found, $VTOY_NO_ISO_TIP"
-    elif [ -n "$VTOY_DEFAULT_SEARCH_ROOT" ]; then
-        NO_ISO_MENU="No ISO files found, please check VTOY_DEFAULT_SEARCH_ROOT"
-    else
-        NO_ISO_MENU="No ISO files found"
-    fi
-    menuentry "$NO_ISO_MENU (Press enter to reboot ...)" {
-        echo -e "\n    Rebooting ... "
-        reboot
-    }
-fi