Reactive compute doesnt respect always_update

[kdkavanagh]

When a reactive update is compute'd, its return value is compared to the current before invoking any watchers, irrespective of whether the reactive object is marked as always_update due to this logic here: https://github.com/Textualize/textual/blob/main/src/textual/reactive.py#L393-L396

[github-actions]

We found the following entries in the FAQ which you may find helpful:

• No widget called TextLog
• How can I select and copy text in a Textual app?
• How do I center a widget in a screen?

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