…dmaicher)

This PR was merged into the 2.8 branch.

Discussion
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[EventDispatcher] fix: unwrap listeners for correct info

| Q             | A
| ------------- | ---
| Branch?       | 2.8
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | related to #22520
| License       | MIT
| Doc PR        | -

Fixes problem where listeners were displayed as `Symfony\Component\EventDispatcher\Debug\WrappedListener::__invoke() ` in the profiler. It now shows the correct callable.

Commits
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d8c5869 [EventDispatcher] fix: unwrap listeners for correct info

This PR was merged into the 3.2 branch.

Discussion
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[EventDispatcher] fix merge of #22541 from 2.8

| Q             | A
| ------------- | ---
| Branch?       | 3.2
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | -
| License       | MIT
| Doc PR        | -

This cleans up a test case that was merged from 2.8 into 3.2 here: 824dc8b

@fabpot due to different implementations I created 2 PR's:

2.8: #22541
3.2: #22568

So the 2.8 merge into 3.2 of my change-set introduced some unused variable `$isWrapped` here: 824dc8b#diff-af3c4fbca8bb77957c00087543ae5a4dR113

This PR just cleans it up and also removes the data provider 😉

Commits
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f67eba8 [EventDispatcher] fix merge of #22541 from 2.8

* 3.2:
  [appveyor] Run the test suite on PHP 7.1
  [appveyor][3.x] Run the test suite on PHP 7.1
  [EventDispatcher] fix merge of #22541 from 2.8
  bumped Symfony version to 3.2.9
  updated VERSION for 3.2.8
  updated CHANGELOG for 3.2.8
  bumped Symfony version to 2.8.21
  updated VERSION for 2.8.20
  updated CHANGELOG for 2.8.20
  bumped Symfony version to 2.7.28
  updated VERSION for 2.7.27
  update CONTRIBUTORS for 2.7.27
  updated CHANGELOG for 2.7.27