script, test: fix python linter E275 errors with flake8 5.0.4

test/functional/p2p_blocksonly.py

@@ -104,7 +104,7 @@ class P2PBlocksOnly(BitcoinTestFramework):
         self.nodes[0].setmocktime(int(time.time()) + 60)
 
         conn.sync_send_with_ping()
-        assert(int(txid, 16) not in conn.get_invs())
+        assert int(txid, 16) not in conn.get_invs()
 
     def check_p2p_inv_violation(self, peer):
         self.log.info("Check that tx-invs from P2P are rejected and result in disconnect")