[Users] Claws now displaying Notice when drag'n'dropping an attachment

[Colin Leroy-Mira]

Hi, 

> I think I favour just removing it completely. It doesn't seem to have any
> reasonable purpose or usefulness...

I think the purpose is to warn for attachments done using --compose --attach, but I'm not sure it's important.
I must have messed up the alert logic when working on image copy pasting. 
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