Remove grub.cfg max resolution script function.

INSTALL/grub/grub.cfg

@@ -34,20 +34,6 @@ function ventoy_debug_pause {
 }
 
 
-function ventoy_max_resolution {
-    #Skip this for VirtualBox
-    smbios -t 1 -s 0x05 --set=system_product;
-    if vt_str_casebegin "$system_product"  "VirtualBox"; then
-        return
-    fi
-
-    vt_enum_video_mode
-    vt_get_video_mode 0 vtCurMode
-    terminal_output console
-    set gfxmode=$vtCurMode
-    terminal_output gfxterm
-}
-
 function ventoy_cli_console {
     if [ -z "$vtoy_display_mode" ]; then
         terminal_output  console
@@ -662,7 +648,6 @@ function uefi_windows_menu_func {
 
     if [ -n "$vtoy_chain_mem_addr" ]; then
         ventoy_acpi_param ${vtoy_chain_mem_addr} 2048
-        ventoy_max_resolution
         chainloader ${vtoy_path}/ventoy_${VTOY_EFI_ARCH}.efi  env_param=${env_param} isoefi=${LoadIsoEfiDriver} iso_${ventoy_fs_probe} ${vtdebug_flag} mem:${vtoy_chain_mem_addr}:size:${vtoy_chain_mem_size}
         boot
     else