Reword "Starting:" line so 0 suites reads naturally

Simply running tests printed:
Starting: 0 suites with X tests
which didn't make any sense even though it was valid and true.

Signed-off-by: Richard Alpe <richard@bit42.se>

Author: rical

9pm.py

@@ -844,7 +844,7 @@ def main():
     probe_suite(suite)
 
     n_suites, n_tests = count_suite_tree(suite)
-    print(f"\nStarting: {n_suites} suites with {n_tests} tests")
+    print(f"\nStarting: {n_suites} suites, {n_tests} tests")
 
     setup_env(args)