Install the HWTest SD folder on payload and desktop.

HWTest 0.15 only opens its GUI when sd:/hwtest is present, so clean and update installs now replace and copy that directory.

source/install_update.c

@@ -113,6 +113,10 @@ int update_mode_install(omninx_variant_t variant) {
     res = folder_copy_with_progress_v2(src_path, "sd:/", "warmboot_mariko/");
     if (res != FR_OK && res != FR_NO_FILE) return res;
 
+    s_printf(src_path, "%s/hwtest", staging);
+    res = folder_copy_with_progress_v2(src_path, "sd:/", "hwtest/");
+    if (res != FR_OK && res != FR_NO_FILE) return res;
+
     if (variant == VARIANT_OC) {
         s_printf(src_path, "%s/SaltySD", staging);
         res = folder_copy_with_progress_v2(src_path, "sd:/", "SaltySD/");