[MlMt] Check for Test Build

[Quinn Comendant]

I've also noticed that there is an inconsistency between the different 
ways to check for updates. Here are the messages I see when checking for 
updates:

## 1. Settings → Software Update → Check Now

> 5937 is the latest version available. You have version 6022.

## 2. Settings → Software Update → Check Now (holding *option*)

> 6016 is the latest version available. You have version 6022.

## 3. MailMate menu → Check for Update

> 5937 is the latest version available. You have version 6022.

## 4. MailMate menu → Check for Test Build (holding *option*)

> 5937 is the latest version available. You have version 6022.

#2 and #4 should display the same results, but they do not. I raised 
this issue in October 2023 but didn't get a response.

Quinn
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.freron.com/pipermail/mailmate/attachments/20240304/6a2d0f91/attachment.htm>