Update testnet.md

docs/v3/documentation/smart-contracts/getting-started/testnet.md

@@ -15,7 +15,7 @@ Coins in the test network have no value, and the network can be reset at any tim
 For convenience, nearly the entire mainnet infrastructure (wallets, APIs, bridges, etc.) has been replicated in the test network.
 
 * Explorer: https://testnet.tonscan.org
-* Web wallet: https://wallet.ton.org?testnet=true
+* Web wallet: https://wallet.ton.org/?testnet=true
 * Browser extension: use [mainnet browser extension](https://chrome.google.com/webstore/detail/ton-wallet/nphplpgoakhhjchkkhmiggakijnkhfnd) and [do this](https://github.com/toncenter/ton-wallet#switch-between-mainnettestnet-in-extension).
 * Testnet TON Center API: https://testnet.toncenter.com
 * Testnet HTTP API: https://testnet.tonapi.io/