add rednet open to action 3 and 4

src/main.lua

@@ -861,6 +861,7 @@ while true do
     if action == 3 then
         expwarn()
 
+        peripheral.find("modem", rednet.open)
         reset()
         for _,v in pairs(fs.list("designs")) do
             term.write(v)
@@ -931,6 +932,7 @@ while true do
     if action == 4 then
         expwarn()
 
+        peripheral.find("modem", rednet.open)
         reset()
         term.write("Enter the code: ")
         local code = read()