Small correction for SHC_SAVAGE_IMPACT and SHC_DANCING_KNIFE skills (#7496)

* Small correction for SHC_SAVAGE_IMPACT and SHC_DANCING_KNIFE skills
* SHC_SAVAGE_IMPACT should move the player from 1 cell to the target, between the target and the player
* SHC_DANCING_KNIFE shouldn't force the player to stand
* The behaviour should be the same for GC_CROSSIMPACT than SHC_SAVAGE_IMPACT

Thanks to @aleos89 @Lemongrass3110 !

src/map/script.cpp

@@ -22208,7 +22208,7 @@ BUILDIN_FUNC(pushpc)
 	}
 	else if(cells<0)
 	{// pushing backwards
-		dir = (dir+DIR_MAX/2)%DIR_MAX;  // turn around
+		dir = direction_opposite( static_cast<enum directions>( dir ) ); // turn around
 		cells     = -cells;
 	}