Invalid default screenshot file name in Windows.

[kmonson]

Default screenshot filename format in App.save_screenshot (specifically time_format) results in colons in the default file name. This is invalid in Windows.

OSError: [Errno 22] Invalid argument: './textual demo 2022-10-23 16:00:23 341765.svg'

An additional replace call here is probably needed: https://github.com/Textualize/textual/blob/main/src/textual/app.py#L538

[davep]

Good catch, thanks.

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