bug symfony#26368 [WebProfilerBundle] Fix Debug toolbar breaks app (xkobal)

This PR was squashed before being merged into the 2.7 branch (closes symfony#26368).

Discussion
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[WebProfilerBundle] Fix Debug toolbar breaks app

| Q             | A
| ------------- | ---
| Branch?       | 2.7
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes    <!-- please add some, will be required by reviewers -->
| Fixed tickets | symfony#26364
| License       | MIT
| Doc PR        | symfony/symfony-docs#... <!-- required for new features -->

Wrong method is used to count `tbody.rows`

Commits
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52f187e [WebProfilerBundle] Fix Debug toolbar breaks app

Author: nicolas-grekas

src/Symfony/Bundle/WebProfilerBundle/Resources/views/Profiler/base_js.html.twig

@@ -108,7 +108,7 @@
                     var rows = document.createDocumentFragment();
 
                     if (requestStack.length) {
-                        var nbOfAjaxRequest = tbodies.rows.count();
+                        var nbOfAjaxRequest = tbodies.rows.length;
                         if (nbOfAjaxRequest >= 100) {
                             tbodies.deleteRow(nbOfAjaxRequest - 1);
                         }