android: Add wnwen to OWNERS

To help maintain android_build_server_helper.py and revert any failing
changes to it.

R=sokcevic@google.com

Bug: 393136861
Change-Id: Ib4d111ffa03e21a3d733dec64141e7d00da573b9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/6499329
Commit-Queue: Peter Wen <wnwen@chromium.org>
Reviewed-by: Josip Sokcevic <sokcevic@chromium.org>
Auto-Submit: Peter Wen <wnwen@chromium.org>
Commit-Queue: Josip Sokcevic <sokcevic@chromium.org>

OWNERS

@@ -22,6 +22,7 @@ per-file ninja*=file://BUILD_OWNERS
 per-file post_build_ninja_summary.py=file://BUILD_OWNERS
 per-file android_build_server_helper.py=mheikal@chromium.org
 per-file android_build_server_helper.py=agrieve@chromium.org
+per-file android_build_server_helper.py=wnwen@chromium.org
 
 # GN
 per-file gn*=dpranke@google.com