minor #29555 [WebProfilerBundle] Improve PHP extension badges (ro0NL)

This PR was merged into the 4.3-dev branch.

Discussion
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[WebProfilerBundle] Improve PHP extension badges

| Q             | A
| ------------- | ---
| Branch?       | master
| Bug fix?      | no
| New feature?  | yes
| BC breaks?    | no     <!-- see https://symfony.com/bc -->
| Deprecations? | no
| Tests pass?   | yes    <!-- please add some, will be required by reviewers -->
| Fixed tickets | #29374
| License       | MIT
| Doc PR        | symfony/symfony-docs#... <!-- required for new features -->

![image](https://user-images.githubusercontent.com/1047696/49753655-5c70a880-fcb4-11e8-9c87-8f7586a27e5c.png)

![image](https://user-images.githubusercontent.com/1047696/49753831-cf7a1f00-fcb4-11e8-992b-fec4ed4ef4e0.png)

![image](https://user-images.githubusercontent.com/1047696/49753849-da34b400-fcb4-11e8-851c-3bfe0fc1fbfd.png)

Commits
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4399dab [WebProfilerBundle] Fix php extension badges

src/Symfony/Bundle/WebProfilerBundle/Resources/views/Collector/config.html.twig

@@ -64,9 +64,9 @@
 
             <div class="sf-toolbar-info-piece sf-toolbar-info-php-ext">
                 <b>PHP Extensions</b>
-                <span class="sf-toolbar-status sf-toolbar-status-{{ collector.hasxdebug ? 'green' : 'red' }}">xdebug</span>
-                <span class="sf-toolbar-status sf-toolbar-status-{{ collector.hasapcu ? 'green' : 'red' }}">APCu</span>
-                <span class="sf-toolbar-status sf-toolbar-status-{{ collector.haszendopcache ? 'green' : 'red' }}">OPcache</span>
+                <span class="sf-toolbar-status sf-toolbar-status-{{ collector.hasxdebug ? 'green' : 'gray' }}">xdebug {{ collector.hasxdebug ? '✓' : '✗' }}</span>
+                <span class="sf-toolbar-status sf-toolbar-status-{{ collector.hasapcu ? 'green' : 'gray' }}">APCu {{ collector.hasapcu ? '✓' : '✗' }}</span>
+                <span class="sf-toolbar-status sf-toolbar-status-{{ collector.haszendopcache ? 'green' : 'red' }}">OPcache {{ collector.haszendopcache ? '✓' : '✗' }}</span>
             </div>
 
             <div class="sf-toolbar-info-piece">
@@ -187,12 +187,12 @@
         </div>
 
         <div class="metric">
-            <span class="value">{{ include('@WebProfiler/Icon/' ~ (collector.hasapcu ? 'yes' : 'no') ~ '.svg') }}</span>
+            <span class="value">{{ include('@WebProfiler/Icon/' ~ (collector.hasapcu ? 'yes' : 'no-gray') ~ '.svg') }}</span>
             <span class="label">APCu</span>
         </div>
 
         <div class="metric">
-            <span class="value">{{ include('@WebProfiler/Icon/' ~ (collector.hasxdebug ? 'yes' : 'no') ~ '.svg') }}</span>
+            <span class="value">{{ include('@WebProfiler/Icon/' ~ (collector.hasxdebug ? 'yes' : 'no-gray') ~ '.svg') }}</span>
             <span class="label">Xdebug</span>
         </div>
     </div>