[MlMt] Contrast with r5530 in light mode

[Philip Paeps]

I've just updated to r5530 and I really like the improved mailbox list.  
Thanks Benny.

A couple of small nits though:

* Mailbox names turn white after they've been looked at
* They become completely unreadable when the window doesn't have focus

Screenshot: https://trouble.is/~philip/20181003-mailmate-colours.png

I know everyone is hyping on dark mode but I'm really not a fan.

Philip

-- 
Philip Paeps
Senior Reality Engineer
Ministry of Information
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