Fix: Remove duplicate clean method calls

[starrye]

Description

Fixes #

Where has this been tested?

• Platform(s): Ubuntu
• Python version(s): 3.8
• Unreal Engine version(s): 5
• CARLA version: 0.9.15

Possible Drawbacks

Hello, when I added custom logic to CarlaDataProvider clean, I found that it was called many times. And I saw in Class ScenarioRunner _cleanup method calls the self.manager. cleanup () and CarlaDataProvider. cleanup (), Of the self.manager.cleanup () includes CarlaDataProvider.cleanup(), so can make CarlaDataProvider.cleanup() method is called three times, In fact, after stopping the operation in ScenarioManager.run_scenario(), self.cleanup()will be called immediately, which already containsCarlaDataProvider.cleanup(), So consider removing the redundant clean method call in the _cleanup method of the ScenarioRunner class

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This change is 

[starrye]

@PabloVD please review