bug symfony#18407 Fixed the "hover" state of the profiler sidebar menu (javiereguiluz)

This PR was submitted for the master branch but it was merged into the 2.8 branch instead (closes symfony#18407).

Discussion
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Fixed the "hover" state of the profiler sidebar menu

| Q             | A
| ------------- | ---
| Branch?       | 2.8
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | symfony#18405
| License       | MIT
| Doc PR        | -

### Before

![before_sidebar](https://cloud.githubusercontent.com/assets/73419/14209368/2cc6e168-f824-11e5-91e7-70fab8d64d12.gif)

### After

![after_sidebar](https://cloud.githubusercontent.com/assets/73419/14209376/3295d7a2-f824-11e5-94b5-254f1fc4e027.gif)

Commits
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85deb30 Fixed the "hover" state of the profiler sidebar menu

Author: fabpot

src/Symfony/Bundle/WebProfilerBundle/Resources/views/Profiler/profiler.css.twig

@@ -515,7 +515,9 @@ tr.status-warning td {
     margin-bottom: -99999px; {# needed for 'same-height columns' trick #}
     margin-left: -100%;
     padding-bottom: 99999px; {# needed for 'same-height columns' trick #}
+    position: relative;
     width: 220px;
+    z-index: 9999;
 }
 #sidebar .module {
     padding: 10px;