Bug 1230861 - remove add-ons manager from ESLint ignore file. r=mossop

--HG--
extra : transplant_source : B%C5/%B6%0E5H%89n%B2%CA%5E%9F%F7%0A%40_%11%C8%7C

.eslintignore

@@ -188,7 +188,6 @@ toolkit/modules/tests/xpcshell/test_task.js
 toolkit/components/osfile/**
 toolkit/components/passwordmgr/**
 toolkit/components/places/**
-toolkit/mozapps/extensions/**
 
 # Uses preprocessing
 toolkit/content/contentAreaUtils.js