Bug 1599160 - Wait for less zoom messages in a DAMP test. r=nchevobbe,perftest-reviewers,sparky

DAMP refreshes the page that it loads, and it bypasses the caches, but
we still coalesce in-progress loads, so it's expected to see less of
this.

This actually caught another issue, that I'm fixing in bug 1645180.

Differential Revision: https://phabricator.services.mozilla.com/D79352

testing/talos/talos/tests/devtools/addon/content/tests/webconsole/complicated.js

@@ -18,7 +18,7 @@ const { AppConstants } = require("resource://gre/modules/AppConstants.jsm");
 const EXPECTED_MESSAGES = [
   {
     text: `This page uses the non standard property “zoom”`,
-    count: isFissionEnabled() ? 2 : 4,
+    count: isFissionEnabled() ? 1 : 2,
     visibleWhenFissionEnabled: true,
   },
   {