textual run behaviour no longer matches the docs

[davep]

It seems that as of v0.21.0 the behaviour of textual run doesn't match that in the docs. Taking our examples as a place to test, if I do the following:

$ textual run five_by_five.py

the example runs fine. However, if I remove this:

if __name__ == "__main__":
    FiveByFive().run()

from the end of the file then this:

$ textual run five_by_five.py

silently returns, with no warnings, errors or application shown. According to the docs:

The run sub-command will first look for a App instance called app in the global scope of your Python file. If there is no app, it will create an instance of the first App class it finds and run that.

which means that it should have seen there's no top-level variable called app and should have found FiveByFive and run that.

If this is intended new behaviour we should change the docs; if not it looks like #2338 removed some behaviour.

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