Bug 1548137 - Change bug component for build/mobile; r=jmaher

Differential Revision: https://phabricator.services.mozilla.com/D29428

--HG--
extra : moz-landing-system : lando

build/moz.build

@@ -6,6 +6,8 @@
 
 with Files('**'):
     BUG_COMPONENT = ('Firefox Build System', 'General')
+with Files("mobile/**"):
+    BUG_COMPONENT = ("Firefox for Android", "Testing")
 
 # This cannot be named "build" because of bug 922191.
 SPHINX_TREES['buildsystem'] = 'docs'