Add muzei to run_on_app_dumps

Contents of README.google:
Name: Muzei Live Wallpaper
URL: https://github.com/romannurik/muzei
Version: NA
Revision: 9eac6e98aebeaf0ae40bdcd85f16dd2886551138
Date: Nov 2, 2020
License: Apache License 2.0

Bug: 152155164
Change-Id: I2037dacda9a04a793ada29ee38705f261dd55e49
diff --git a/.gitignore b/.gitignore
index e25cdf5..2dc519d 100644
--- a/.gitignore
+++ b/.gitignore
@@ -144,6 +144,8 @@
 third_party/opensource-apps/materialistic.tar.gz
 third_party/opensource-apps/minimal-todo
 third_party/opensource-apps/minimal-todo.tar.gz
+third_party/opensource-apps/muzei
+third_party/opensource-apps/muzei.tar.gz
 third_party/opensource-apps/sunflower
 third_party/opensource-apps/sunflower.tar.gz
 third_party/opensource-apps/wikipedia