fix allowfullscreen boolean attr

app/ui/scalatags.scala

@@ -24,7 +24,7 @@ trait ScalatagsAttrs {
   lazy val novalidate = attr("novalidate").empty
   object frame {
     val scrolling = attr("scrolling")
-    val allowfullscreen = attr("allowfullscreen")
+    val allowfullscreen = attr("allowfullscreen").empty
     val autoplay = attr("autoplay")
   }
 }

app/views/coach/show.scala

@@ -91,7 +91,7 @@ $('.coach-review-form form').show();
               ),
               div(cls := "list")(
                 profile.youtubeUrls.map { url =>
-                  iframe(width := "256", height := "192", src := url.value, attr("frameborder") := "0", attr("allowfullscreen") := true)
+                  iframe(width := "256", height := "192", src := url.value, attr("frameborder") := "0", frame.allowfullscreen)
                 }
               )
             )

app/views/streamer/show.scala

@@ -70,14 +70,14 @@ method:'post'
               iframe(
                 src := s"https://www.youtube.com/embed/$videoId?autoplay=1",
                 st.frameBorder := "0",
-                frame.allowfullscreen := true
+                frame.allowfullscreen
               )
             )
             case _ => s.streamer.twitch.map { twitch =>
               div(cls := "box embed twitch")(
                 iframe(
                   src := s"https://player.twitch.tv/?channel=${twitch.userId}",
-                  frame.allowfullscreen := true,
+                  frame.allowfullscreen,
                   frame.autoplay := true
                 )
               )

app/views/video/show.scala

@@ -30,7 +30,7 @@ object show {
           div(cls := "embed")(
             iframe(id := "ytplayer", tpe := "text/html",
               src := s"https://www.youtube.com/embed/${video.id}?autoplay=1&origin=https://lichess.org&start=${video.startTime}",
-              st.frameBorder := "0", frame.allowfullscreen := true)
+              st.frameBorder := "0", frame.allowfullscreen)
           ),
           h1(cls := "box__pad")(
             a(cls := "is4 text", dataIcon := "i", href := s"${routes.Video.index}?${control.queryString}"),