SyntaxWarning for loading indicator widget

[charles-001]

I receive this warning after upgrading to 0.52.0:

/Users/cthompson/Library/Caches/pypoetry/virtualenvs/dolphie-z84eXs3q-py3.11/lib/python3.11/site-packages/textual/widgets/_loading_indicator.py:57: SyntaxWarning: "is" with a literal. Did you mean "=="?
  if self.app.animation_level is "none":

https://github.com/Textualize/textual/blob/main/src/textual/widgets/_loading_indicator.py#L57

Seems we just need to change is "none" to == "none"

[willmcgugan]

Let's fix this and get a patch release out today

[davep]

On it.

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