holomaze: when yanking a distant camera back, do it better.

Specifically, bring it back to less than PLAYER_RADIUS from the player,
so it's known to be an accessible spot, and reset clocprev, so the jump
doesn't trip camera triggers (likely the same ones that kept it distant
to begin with).  It'll get pushed away again, but that'll get handled
correctly by triggers if the player is too close to a wall.