Unrestrict visibility of video_codec_tester

Bug: webrtc:14852
Change-Id: Iabfe6c994c0b35b03f4cd9c83b6bdfc2e8bbcc08
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/474283
Commit-Queue: Sergey Silkin <ssilkin@webrtc.org>
Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#47764}

test/BUILD.gn

diff --git a/test/BUILD.gn b/test/BUILD.gn
index 97bfc93..e16a10a 100644
--- a/test/BUILD.gn
+++ b/test/BUILD.gn
@@ -1475,6 +1475,7 @@
 }
 
 rtc_library("video_codec_tester") {
+  visibility = [ "*" ]
   testonly = true
   sources = [
     "video_codec_tester.cc",