Enable only results failures by default (#4511)

Co-authored-by: Peter McNeeley <petermcneeley@google.com>

Author: petermcneeleychromium

standalone/index.html

@@ -452,7 +452,7 @@ <h1><img class="logo" src="webgpu-logo-notext.svg">WebGPU Conformance Test Suite
     <fieldset>
       <legend>Serialize results:</legend>
       <p>
-        <label><input type="checkbox" id="saveOnlyFailures">Only result failures</label>
+        <label><input type="checkbox" id="saveOnlyFailures" checked>Only result failures</label>
       </p>
       <p>
          <input type="button" id="copyResultsJSON" value="Copy results as JSON">