Transform backslash into slashes in DOC_FOLDER variable for browser-ui-test

Author: GuillaumeGomez

src/tools/rustdoc-gui/tester.js

@@ -201,8 +201,8 @@ async function main(argv) {
     try {
         // This is more convenient that setting fields one by one.
         const args = [
-            "--variable", "DOC_PATH", opts["doc_folder"], "--enable-fail-on-js-error",
-            "--allow-file-access-from-files",
+            "--variable", "DOC_PATH", opts["doc_folder"].split("\\").join("/"),
+            "--enable-fail-on-js-error", "--allow-file-access-from-files",
         ];
         if (opts["debug"]) {
             debug = true;