Code formatting updates (#4502)

* Editorconfig: Add space_before_self_closing setting

This was a difference between the way dotnet-format and Rider format code. See https://www.jetbrains.com/help/rider/EditorConfig_Index.html

* Editorconfig: Keep 4 spaces indentation for Swagger JSON files

They are all formatted that way, let's keep it like that.

* Apply dotnet-format, mostly white-space related changes

BTCPayServer/PayoutProcessors/UIPayoutProcessorsController.cs

@@ -59,7 +59,7 @@ public class UIPayoutProcessorsController : Controller
             return new StorePayoutProcessorsView() { Factory = factory, Configured = conf };
         }).ToList());
     }
-    
+
     [HttpPost("~/stores/{storeId}/payout-processors/{id}/remove")]
     [Authorize(AuthenticationSchemes = AuthenticationSchemes.Cookie)]
     [Authorize(Policy = Policies.CanModifyStoreSettings, AuthenticationSchemes = AuthenticationSchemes.Cookie)]
@@ -78,8 +78,8 @@ public class UIPayoutProcessorsController : Controller
             Message = "Payout Processor removed"
         });
         await tcs.Task;
-        return RedirectToAction("ConfigureStorePayoutProcessors",new {storeId});
-        
+        return RedirectToAction("ConfigureStorePayoutProcessors", new { storeId });
+
     }
 
     public class StorePayoutProcessorsView