tests: increase validator-clone startup time (#1635)

tests/validator-clone/Anchor.toml

@@ -14,7 +14,7 @@ wallet = "~/.config/solana/id.json"
 test = "yarn run ts-mocha -p ./tsconfig.json -t 1000000 tests/**/*.ts"
 
 [test]
-startup_wait = 10000
+startup_wait = 20000
 
 [test.validator]
 url = "https://api.mainnet-beta.solana.com"