Vanadium: update size in update notification

[gumida]

Not sure if this is really a thing, but it seems weird to me as a user:

Whenever the App Store notifies me about an update for Vanadium, it mentions a size of about 158 MB:

However, when I click on the notification to get the update, the sizes don't match (here it's more like 68 MB):

I only noticed this with Vanadium updates.

[thestinger]

This is due to the Vanadium Library which isn't a regular app and currently needs very special handling due to Android not allowing using regular APIs for it.