Extensions: respect allowRemoteExtensions in default settings
Created by: chrismwendt
Prior to this change, allowRemoteExtensions
would not have any effect on default settings, causing the browser to log a warning when it couldn't find the manifest for extensions that are enabled by default.
After this change, the default settings will be filtered using allowRemoteExtensions
so that no warnings are logged.
Fixes https://github.com/sourcegraph/sourcegraph/issues/3351
Test plan: follow repro steps in https://github.com/sourcegraph/sourcegraph/issues/3351 and notice no warnings get logged