Bumped the Mozilla Stumbler to 1.6.1
The 1.6.0 release had crashes on some devices, so this MR has been updated to include the 1.6.1 tag
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
The 1.6.0 release had crashes on some devices, so this MR has been updated to include the 1.6.1 tag