Port 1576409 - Replace bugzilla component 'Activity Streams: Newtab' with 'New Tab Page' in moz.build file. r=Mardak DONTBUILD

moz.build

@@ -5,7 +5,7 @@
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
 with Files("**"):
-    BUG_COMPONENT = ("Firefox", "Activity Streams: Newtab")
+    BUG_COMPONENT = ("Firefox", "New Tab Page")
 
 BROWSER_CHROME_MANIFESTS += ['test/browser/browser.ini']