[owners] Remove scroggo@google.com from libs/tonemap/OWNERS

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Change-Id: I6475095b75805839da3ca30c2ff9e1e6546acde3

Author: Owner Cleanup Bot

libs/tonemap/OWNERS

@@ -1,4 +1,3 @@
 alecmouri@google.com
 jreck@google.com
 sallyqi@google.com
-scroggo@google.com