OO-1721 don't set video container width, make it responsive

src/main/webapp/static/js/tinymce4/tinymce/plugins/olatmovieviewer/plugin.js

@@ -366,7 +366,7 @@
 					id:domIdentity,
 					name:domIdentity,
 					"class":"olatFlashMovieViewer",
-					"style":'display:block;border:solid 1px #000; width:' + playerWidth + 'px; height:' + playerHeight + 'px;'
+					"style":'display:block;border:solid 1px #000; width:auto; height:auto; max-width:100%;'
 				},h);
 				return node;
 			};

src/main/webapp/static/themes/light/modules/_content_embedded.scss

@@ -210,12 +210,13 @@ img.b_with_border {
 	@extend %o_video;
 } 
 
-/* movie player responsive fix */
+/* movie player responsive fix, compatibility with old embedded movies */
 span.olatFlashMovieViewer {
-	max-width: 100%;
+	max-width: 100% !important;
+	width: auto !important;
 	height: auto !important;
 }
-.mejs-container, .mejs-mediaelement video, .mejs-layers div {
+.mejs-container, .mejs-mediaelement video, .mejs-layers div, .me-cannotplay {
 	max-width: 100%;
 }