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/Controllers/UILNURLAuthController.cs

@@ -49,7 +49,8 @@ namespace BTCPayServer
 
             TempData.SetStatusMessageModel(new StatusMessageModel
             {
-                Severity = StatusMessageModel.StatusSeverity.Success, Html = "LNURL Auth was removed successfully."
+                Severity = StatusMessageModel.StatusSeverity.Success,
+                Html = "LNURL Auth was removed successfully."
             });
 
             return RedirectToList();
@@ -108,7 +109,8 @@ namespace BTCPayServer
 
             return BadRequest(new LNUrlStatusResponse
             {
-                Reason = "The challenge could not be verified", Status = "ERROR"
+                Reason = "The challenge could not be verified",
+                Status = "ERROR"
             });
         }
 
@@ -132,7 +134,8 @@ namespace BTCPayServer
 
             return BadRequest(new LNUrlStatusResponse
             {
-                Reason = "The challenge could not be verified", Status = "ERROR"
+                Reason = "The challenge could not be verified",
+                Status = "ERROR"
             });
         }