Fix janky_time metric by remove extra brackets.

Somehow I missed this and added extra brackets. This fixes the syntax issue.

Change-Id: I364267b21fa01168cbeb0f63d4270a4b97794d0c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2187173Reviewed-by: Stephen Nusko <nuskos@chromium.org>
Reviewed-by: Mikhail Khokhlov <khokhlov@google.com>
Commit-Queue: Stephen Nusko <nuskos@chromium.org>
Auto-Submit: Stephen Nusko <nuskos@chromium.org>
Cr-Commit-Position: refs/heads/master@{#766454}

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

@@ -217,7 +217,7 @@ CREATE TABLE ScrollJanksMaybeNull AS
       currGestureScrollId != prevGestureScrollId OR
       prevTs IS NULL OR
       prevTs < currScrollBeginTs OR
-      prevTs > currScrollEndTs))
+      prevTs > currScrollEndTs
     THEN
       0 ELSE
       currScrollFramesExact > prevScrollFramesExact + 0.5