test: add executable flag for wallet_watchonly.py
test: add executable flag for wallet_watchonly.py

Former-commit-id: fa1aa5a4d5ae6729877787ee94c6197e7ab7871a
syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin