[tools/perf] Fix numJankyUpdates computation in a jank metric

Change-Id: I007c0d8224522346d252f7703e78b6487a679d6b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2096961Reviewed-by: Stephen Nusko <nuskos@chromium.org>
Commit-Queue: Mikhail Khokhlov <khokhlov@google.com>
Cr-Commit-Position: refs/heads/master@{#749245}

tools/perf/core/tbmv3/metrics/janky_time_per_scroll_processing_time.sql

@@ -289,7 +289,7 @@ CREATE TABLE janky_time_per_scroll_processing_time AS
       COALESCE(totalProcessingNanos, 0) / 1000000
     FROM JankyNanosPerScrollNanosMaybeNull) AS processingMillis,
     (SELECT
-      COALESCE(numJankyUpdates, 0) / 1000000
+      COALESCE(numJankyUpdates, 0)
     FROM JankyNanosPerScrollNanosMaybeNull) AS numJankyUpdates;
 
 -- Specify how to fill the metrics proto properly.