minor #882 Delete duplicate sensio_framework_extra config (Tobion)

This PR was merged into the master branch.

Discussion
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Delete duplicate sensio_framework_extra config

It exists already as https://github.com/symfony/demo/blob/bbe5180a8c3b6886ea59227df83de59a4573e586/config/packages/sensio_framework_extra.yaml

Commits
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537f2e8 Delete duplicate sensio_framework_extra config

Author: javiereguiluz