fix: adjust target reach assumption immediately after setting

[luan]

This is a pretty subtle bug, but it prevents the challenge spell from working most of the time. This is what occurs:

1. Monster attacks someone, it's their only option for a target when they do, so whether or not they can reach it, it sets it; it keeps trying to set it until it works
2. Someone challenges it; it sets its target to the new person (which runs the code above)
3. onThink runs, hasFollowPath is still false because we haven't had time to run the path finding algo yet; we think it's unreachable and switch away to the other target (with we already had a path for)

Solution: by "assuming" we have a path, we let the pathfinding algo run, in the meantime onThink assumes everything is OK.

[sonarcloud]

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