Replace deprecated PWA tag with newer one (rails#52738)

* Replace deprecated PWA tag with newer one

* Include both tags for now

Author: pas256

railties/lib/rails/generators/rails/app/templates/app/views/layouts/application.html.erb.tt

@@ -4,6 +4,7 @@
     <title><%%= content_for(:title) || "<%= app_name.titleize %>" %></title>
     <meta name="viewport" content="width=device-width,initial-scale=1">
     <meta name="apple-mobile-web-app-capable" content="yes">
+    <meta name="mobile-web-app-capable" content="yes">
     <%%= csrf_meta_tags %>
     <%%= csp_meta_tag %>