Fixes burst weapons not properly having weapon spread when dual wielded (#17149)

code/modules/projectiles/gun.dm

@@ -37,7 +37,6 @@
 	var/list/restricted_species
 
 	var/spread = 0
-	var/randomspread = 1
 
 	var/unique_rename = TRUE //allows renaming with a pen
 	var/unique_reskin = FALSE //allows one-time reskinning
@@ -237,10 +236,7 @@
 				if( i>1 && !(src in get_both_hands(user))) //for burst firing
 					break
 			if(chambered)
-				if(randomspread)
-					sprd = round((rand() - 0.5) * (randomized_gun_spread + randomized_bonus_spread))
-				else
-					sprd = round((i / burst_size - 0.5) * (randomized_gun_spread + randomized_bonus_spread))
+				sprd = round((pick(0.5, -0.5)) * (randomized_gun_spread + randomized_bonus_spread))
 				if(!chambered.fire(target, user, params, ,suppressed, zone_override, sprd))
 					shoot_with_empty_chamber(user)
 					break

code/modules/projectiles/guns/misc/blastcannon.dm

@@ -9,7 +9,6 @@
 	fire_sound = 'sound/weapons/blastcannon.ogg'
 	needs_permit = FALSE
 	clumsy_check = FALSE
-	randomspread = FALSE
 
 	var/obj/item/transfer_valve/bomb