Change minizip OWNERS to Files App team

BUG=None

Change-Id: Iea537ed79f43065df21f87c2063acb2a4b0bcb5e
Reviewed-on: https://chromium-review.googlesource.com/c/1279229Reviewed-by: Yuki Awano <yawano@chromium.org>
Commit-Queue: Anand Mistry <amistry@chromium.org>
Cr-Commit-Position: refs/heads/master@{#602545}

third_party/minizip/OWNERS

-yawano@chromium.org
-mtomasz@chromium.org
+file://ui/file_manager/OWNERS