[WebProfilerBundle] Fix regexp

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #12122
| License       | MIT
| Doc PR        | 

I fixed the regexp for don't see `/app_dev.php/_wdt`.
it seems wrong to have JS escaping here. The JS escaping should be done by the template when rendering the JS. The PHP string should not need to be aware of the fact that it will be used as JS. Escaping is always a responsibility of the rendering layer.