fix: update pinned message when edited

[alexander-fenster]

Hi folks,

I'm fixing the following issue in the macos client (checked on version 9.4.243050 Stable):

1. Pin any message in the chat.
2. Edit the pinned message (either from the same client or from another client).
3. The pinned message in the top panel does not update.

When a pinned message is edited (but the message ID is still the same), it will not be updated in ChatPinnedView.
Fixing that by adding an extra comparison of message content in the update() method.

Thank you!

[CLAassistant]

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1 out of 2 committers have signed the CLA.

✅ alexander-fenster
❌ overtake
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