Fix mobile menu toggle on touch devices#589

AdityaSharma-Git3207 wants to merge 1 commit intowagtail:mainwagtail/wagtail.org:mainfrom

AdityaSharma-Git3207:fix/mobile-menu-toggle-touchAdityaSharma-Git3207/wagtail.org:fix/mobile-menu-toggle-touchCopy head branch name to clipboard