tools/test-events-clightning.py: correct an indent error

Author: darosior

tools/test-events-clightning.py

@@ -266,7 +266,7 @@ def recv(self, conn, outbuf, line):
             # reading it to figure out what went wrong.
             fut = self.executor.submit(self._readmsg, conn)
             try:
-                 msg = fut.result(1)
+                msg = fut.result(1)
             except futures.TimeoutError:
                 msg = None
             if msg: