Use addEventListener uncapturederror (#503)

Author: beaufortfrancois

sample/util.ts

@@ -57,9 +57,9 @@ export function quitIfWebGPUNotAvailable(
   device.lost.then((reason) => {
     fail(`Device lost ("${reason.reason}"):\n${reason.message}`);
   });
-  device.onuncapturederror = (ev) => {
+  device.addEventListener('uncapturederror', (ev) => {
     fail(`Uncaptured error:\n${ev.error.message}`);
-  };
+  });
 }
 
 /** Fail by showing a console error, and dialog box if possible. */