Make strider usable

mods/ENTITIES/mobs_mc/strider.lua

@@ -90,9 +90,12 @@ local strider = {
 
 		-- if driver present allow control of horse
 		if self.driver then
-
+			local pos = self.object:get_pos()
+			local v = self.object:get_velocity()
+			self.object:set_velocity(vector.new(v.x,0,v.z))
 			mcl_mobs.drive(self, "walk", "stand", false, dtime)
-
+			local l = minetest.find_node_near(pos,2,{"group:lava"})
+			if l then self.object:set_pos(vector.new(pos.x,l.y+0.5,pos.z)) end
 			return false -- skip rest of mob functions
 		end