Fix crying obsidian particles (#4583)

LUAs `math.random(a,b)` expects a and b to be integers. `size` was only randomized once.

Reviewed-on: VoxeLibre/VoxeLibre#4583
Reviewed-by: Mikita Wiśniewski <rudzik8@protonmail.com>
Co-authored-by: kno10 <erich.schubert@gmail.com>
Co-committed-by: kno10 <erich.schubert@gmail.com>

mods/ITEMS/mcl_core/functions.lua

@@ -1658,32 +1658,30 @@ end
 
 
 -- Obsidian crying
-
 local crobby_particle = {
-	velocity = vector.new(0,0,0),
+	velocity = vector.zero(),
-	size = math.random(1.3,2.5),
+	acceleration = vector.zero(),
 	texture = "mcl_core_crying_obsidian_tear.png",
+	collisiondetection = false,
 	collision_removal = false,
 }
 
-
 minetest.register_abm({
 	label = "Obsidian cries",
 	nodenames = {"mcl_core:crying_obsidian"},
 	interval = 5,
 	chance = 10,
 	action = function(pos, node)
-		minetest.after(math.random(0.1,1.5),function()
+		minetest.after(0.1 + math.random() * 1.4, function()
 			local pt = table.copy(crobby_particle)
-			pt.acceleration = vector.new(0,0,0)
+			pt.size = 1.3 + math.random() * 1.2
-			pt.collisiondetection = false
+			pt.expirationtime = 0.5 + math.random()
-			pt.expirationtime = math.random(0.5,1.5)
+			pt.pos = vector.offset(pos, math.random() - 0.5, -0.51, math.random() - 0.5)
-			pt.pos = vector.offset(pos,math.random(-0.5,0.5),-0.51,math.random(-0.5,0.5))
 			minetest.add_particle(pt)
 			minetest.after(pt.expirationtime, function()
 				pt.acceleration = vector.new(0, -9, 0)
 				pt.collisiondetection = true
-				pt.expirationtime = math.random(1.2,4.5)
+				pt.expirationtime = 1.2 + math.random() * 3.3
 				minetest.add_particle(pt)
 			end)
 		end)