Replaces Detective's S&W 610 with an L39-45.

Police departments in the real world had already abandoned revolvers by
the turn of the century. A 20th century revolver doesn't make much sense
for a 2040s detective.

Giving the Detective profession what is basically an upgrade of the Cop
profession's M1911 seems more appropriate. Still, this slightly tones
down the Detective's pistol skill to compensate for the nicer gun.