Update eCash.lua

eCash.lua

@@ -243,21 +243,16 @@ local loginButton = login:addButton()
         
         username = usernameInput:getText()
 
-        if not fs.exists("/.usrcache") then
-            local file = fs.open("/.usrcache","w") 
-            file.write(username)
-            file.close()
-        end
-
         login:setVisible(false)
         appFrame:setVisible(true)
         refresh_ui()
     
     end)
 
-if fs.exists("/.usrcache") then
-    local file = fs.open("/.usrcache","r")
-    local username = file.readLine()
+if fs.exists("/config.json") then
+    local file = fs.open("/config.json","r")
+    local file_content = file.readAll()
+    local username = textutils.unserialiseJSON(file_content).username
     file.close()
     usernameInput:setText(username)
 end