Remove mateuszc@google.com from tests/shared/com/android/launcher3/testing/OWNERS

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memberships and affiliations.
If this change is unnecessary or in error, vote CR -1 and the bot
will abandon it. Vote CR +1/2 to approve this change.

See the owner's recent activity for context:
https://android-review.googlesource.com/q/mateuszc@google.com

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Change-Id: Ib5072203e52bac83586b8c3de9a039a0ac5b272f
diff --git a/tests/shared/com/android/launcher3/testing/OWNERS b/tests/shared/com/android/launcher3/testing/OWNERS
index a818d5e..02e8ebc 100644
--- a/tests/shared/com/android/launcher3/testing/OWNERS
+++ b/tests/shared/com/android/launcher3/testing/OWNERS
@@ -2,4 +2,3 @@
 sunnygoyal@google.com
 winsonc@google.com
 hyunyoungs@google.com
-mateuszc@google.com
\ No newline at end of file