Fix black formatting in test_run_command.py

Remove extra blank line after import to satisfy black linter.

Co-Authored-By: Claude Opus 4.6 (1M context) <[email protected]>

Author: oharboe

flow/test/test_run_command.py

@@ -15,7 +15,6 @@
 
 import run_command
 
-
 TIMING_RE = re.compile(
     r"^Elapsed time: (\S+)\[h:\]min:sec\. "
     r"CPU time: user (\S+) sys (\S+) \((\d+)%\)\. "