Fix invalid comparisions with string literals in RSS example

[Daraan]

Description

This PR addresses some string comparisons in the rss_visualization.py that are written like:
ad.rss.state.RssStateEvaluator.LongitudinalDistanceOppositeDirection == "LongitudinalDistanceOppositeDirection" which is always False as the enum is an int and has no support for string comparison.

In the example some arrows on the HUD were therefore always or never printed.

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For verification try this statement which returns False but is intended to be True.

from carla import ad
print(ad.rss.state.RssStateEvaluator.LongitudinalDistanceOppositeDirection == "LongitudinalDistanceOppositeDirection")
# False

Where has this been tested?

• Python version(s): Python 3.10

Possible Drawbacks

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This change is 

[update-docs]

Thanks for opening this pull request! The maintainers of this repository would appreciate it if you would update our CHANGELOG.md based on your changes.