fix: Improve maxResolution detection on Tizen (#8365)

Fixes #8356

Author: avelad

lib/util/platform.js

@@ -756,8 +756,11 @@ shaka.util.Platform = class {
         // Now ignore the error and let the 720p default stand.
       }
     } else if (Platform.isTizen()) {
-      maxResolution.width = 1920;
-      maxResolution.height = 1080;
+      const devicePixelRatio = window.devicePixelRatio;
+      maxResolution.width = window.screen.width * devicePixelRatio > 1920 ?
+          3840 : 1920;
+      maxResolution.height = window.screen.height * devicePixelRatio > 1080 ?
+          2160 : 1080;
       try {
         if (webapis.systeminfo && webapis.systeminfo.getMaxVideoResolution) {
           const maxVideoResolution =