C340-18 redux

Fix the test of otrapped in ohitmon pointed out by <Someone> that was causing
my previous fix to do the exact opposite of the intended behavior.

doc/fixes34.4

@@ -46,6 +46,7 @@ handle lava when removing or losing water walking boots
 fix incomplete sentence occuring when unique monster's corpse fell down stairs
 fractured boulders or statues produced inconsistent object settings on the
 	resulting rocks
+really fix rolling boulder bug C340-18, the previous "fix" reversed the test
 
 
 Platform- and/or Interface-Specific Fixes

src/mthrowu.c

@@ -206,7 +206,7 @@ boolean verbose;  /* give message(s) even when you can't see what happened */
 			? "destroyed" : "killed");
 		/* don't blame hero for unknown rolling boulder trap */
 		if (!context.mon_moving &&
-		    (otmp->otyp != BOULDER || range >= 0 || !otmp->otrapped))
+		    (otmp->otyp != BOULDER || range >= 0 || otmp->otrapped))
 		    xkilled(mtmp,0);
 		else mondied(mtmp);
 	    }