Fix step label for perf tryjob 'Running Without Patch'

Looks like a typo from https://codereview.chromium.org/740633006

BUG=439353

Review URL: https://codereview.chromium.org/778143002

Cr-Commit-Position: refs/heads/master@{#307023}
diff --git a/tools/run-bisect-perf-regression.py b/tools/run-bisect-perf-regression.py
index b1aaceb..133d961 100755
--- a/tools/run-bisect-perf-regression.py
+++ b/tools/run-bisect-perf-regression.py
@@ -423,7 +423,7 @@
 
   results_without_patch = _RunCommandStepForPerformanceTest(
       b, opts, False, True, annotations_dict['results_label2'],
-      annotations_dict['run1'])
+      annotations_dict['run2'])
 
   # Find the link to the cloud stored results file.
   _ParseAndOutputCloudLinks(results_without_patch, results_with_patch)