[tools/perf] Fix a metric name in system_health_inifinite_scroll

Change-Id: Iecb57c62efc068f7b474280586a1f1dee2d8fbfa
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2095055Reviewed-by: Eric Seckler <eseckler@chromium.org>
Commit-Queue: Mikhail Khokhlov <khokhlov@google.com>
Cr-Commit-Position: refs/heads/master@{#748170}

tools/perf/contrib/system_health_infinite_scroll/system_health_infinite_scroll.py

@@ -29,7 +29,7 @@ class SystemHealthInfiniteScroll(system_health.MobileCommonSystemHealth):
     options.SetTimelineBasedMetrics([
         'tbmv3:scroll_jank_metric',
         'tbmv3:janky_scroll_periods',
-        'tmbv3:janky_time_per_scroll_processing_time',
+        'tbmv3:janky_time_per_scroll_processing_time',
     ])
     return options