tests: fix flaky validator-clone test by increasing startup_wait (#1634)

tests/validator-clone/Anchor.toml

@@ -13,6 +13,9 @@ wallet = "~/.config/solana/id.json"
 [scripts]
 test = "yarn run ts-mocha -p ./tsconfig.json -t 1000000 tests/**/*.ts"
 
+[test]
+startup_wait = 10000
+
 [test.validator]
 url = "https://api.mainnet-beta.solana.com"