minor symfony#52813 remove duplicated service definition (xabbuh)

This PR was merged into the 5.4 branch.

Discussion
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remove duplicated service definition

| Q             | A
| ------------- | ---
| Branch?       | 5.4
| Bug fix?      | no
| New feature?  | no
| Deprecations? | no
| Issues        |
| License       | MIT

Commits
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37eec22 remove duplicated service definition

Author: nicolas-grekas

src/Symfony/Component/DependencyInjection/Tests/Fixtures/xml/services14.xml

@@ -3,10 +3,6 @@
            xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
            xsi:schemaLocation="http://symfony.com/schema/dic/services https://symfony.com/schema/dic/services/services-1.0.xsd">
     <services>
-        <service id="monolog.logger" parent="monolog.logger_prototype">
-            <argument index="0">app</argument>
-        </service>
-
         <service id="logger" alias="monolog.logger" />
 
         <service id="monolog.logger" parent="monolog.logger_prototype">