pw_watch: Fix lint problem

Change-Id: I362bd4c50d5deb566bcfe1def80f32d6cb8b9e32
diff --git a/pw_cli/py/pw_cli/watch.py b/pw_cli/py/pw_cli/watch.py
index 308fbd7..f075824 100755
--- a/pw_cli/py/pw_cli/watch.py
+++ b/pw_cli/py/pw_cli/watch.py
@@ -136,7 +136,7 @@
         """Run all the builds in serial and capture pass/fail for each."""
 
         # Clear the screen and show a banner indicating the build is starting.
-        print("\033c", end="")   # TODO(pwbug/38): Not Windows compatible.
+        print("\033c", end="")  # TODO(pwbug/38): Not Windows compatible.
         print(_COLOR.magenta(_BUILD_MESSAGE))
         _LOG.info('Change detected: %s', matching_path)