Add nginx to known proxies (#3002)

* Add nginx to known proxies

* Only add nginx proxy if standard self host deployment

* Style changes

src/Core/Settings/IGlobalSettings.cs

@@ -6,6 +6,8 @@ public interface IGlobalSettings
 {
     // This interface exists for testing. Add settings here as needed for testing
     bool SelfHosted { get; set; }
+    bool UnifiedDeployment { get; set; }
+    string KnownProxies { get; set; }
     bool EnableCloudCommunication { get; set; }
     string LicenseDirectory { get; set; }
     string LicenseCertificatePassword { get; set; }