[freeciv-ai] aiair uses set_unit_activity() directly

[Per Inge Mathisen <per@xxxxxxxxxxx>]

We should whenever possible gate all our server calls through the
appropriate handle_*() functions, instead of doing direct changes to the
server state.

This means, for example, handle_unit_activity_request() instead of
set_unit_activity().

The attached patch fixes two such issues in aiair.c

  - Per

aiair1.diff
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