Update a11y.js typo

the quotes were out of line

Author: mgifford

dist/a11y.js

@@ -215,7 +215,7 @@ return JSON.stringify({
     };
   }),
   screen_reader_classes: captureAndLogError(() => {
-    return document.querySelectorAll('.sr-only, .visually-hidden', '.screen-reader-text', '.element-invisible').length > 0;
+    return document.querySelectorAll('.sr-only', '.visually-hidden', '.screen-reader-text', '.element-invisible').length > 0;
   }),
   form_control_a11y_tree: captureAndLogError(() => {
     const attributes_to_track_regex = /^(aria-.+|type|id|name|placeholder|accept|autocomplete|autofocus|capture|max|maxlength|min|minlength|required|readonly|pattern|multiple|step)$/i;