scaffold CSM: Fix crash from indexing undefined variable

debug.txt:2021-08-18 02:17:31: WARNING[Main]: Undeclared global variable "storage" accessed at scaffold:/railscaffold.lua:151
    debug.txt:2021-08-18 02:17:31: ERROR[Main]: Access denied. Reason: Client environment_step: Runtime error from mod 'scaffold' in callback environment_step(): scaffold:/railscaffold.lua:151: attempt to index global 'storage' (a nil value)
    debug.txt:2021-08-18 02:17:31: ERROR[Main]: 	scaffold:/railscaffold.lua:151: in function 'func'

clientmods/scaffold/init.lua

@@ -10,8 +10,6 @@ scaffold.constrain1 = false
 scaffold.constrain2 = false
 local hwps={}
 
-local storage=minetest.get_mod_storage()
-
 scaffold.wason = {}
 
 local nextact = {}

clientmods/scaffold/railscaffold.lua

@@ -4,7 +4,7 @@
 --west:-x,1.5,-5
 --east:-x,1.5,5
 -- north 5,1.5(3096:2.5,25025:1.5),z
---#local storage = minetest.get_mod_storage()
+local storage = minetest.get_mod_storage()
 local ground = {
     "mesecons_torch:redstoneblock"
 }