Bug 1538475 - Add comma to 'central-to-beta' and 'beta-to-release' generators to prevent concatenation of two folder paths of files to modify r=jlorenzo

Differential Revision: https://phabricator.services.mozilla.com/D24602

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

testing/mozharness/configs/merge_day/beta_to_release.py

@@ -15,7 +15,7 @@ config = {
         ("{}{}".format(d, f),
         "ac_add_options --with-branding=mobile/android/branding/beta",
         "ac_add_options --with-branding=mobile/android/branding/official")
-        for d in ["mobile/android/config/mozconfigs/android-aarch64/"
+        for d in ["mobile/android/config/mozconfigs/android-aarch64/",
                   "mobile/android/config/mozconfigs/android-api-16/",
                   "mobile/android/config/mozconfigs/android-x86/",
                   "mobile/android/config/mozconfigs/android-x86_64/"]

testing/mozharness/configs/merge_day/central_to_beta.py

@@ -14,7 +14,7 @@ config = {
         ("{}{}".format(d, f),
         "ac_add_options --with-branding=mobile/android/branding/nightly",
         "ac_add_options --with-branding=mobile/android/branding/beta")
-        for d in ["mobile/android/config/mozconfigs/android-aarch64/"
+        for d in ["mobile/android/config/mozconfigs/android-aarch64/",
                   "mobile/android/config/mozconfigs/android-api-16/",
                   "mobile/android/config/mozconfigs/android-x86/",
                   "mobile/android/config/mozconfigs/android-x86_64/"]