wlr-foreign: set all initial states correctly

wlr-foreign: set all initial states correctly

Two were missing: "minimized" and "activated".

At least "minimized" can be set before map, so the initial state needs
to be read and set on the foreign-toplevel.

I think in the current code, the foreign-toplevel is always created
before a view is activated, but for future-proofing, let's not rely
on this, and set "activated" as well. There's no harm since wlroots
optimizes away any redundant state changes.