[Ryujinx.Headless.SDL2] Address dotnet-format issues (#5379)

* dotnet format style --severity info

Some changes were manually reverted.

* dotnet format analyzers --serverity info

Some changes have been minimally adapted.

* Restore a few unused methods and variables

* Address or silence dotnet format CA1806 and a few CA1854 warnings

* Address most dotnet format whitespace warnings

* Apply dotnet format whitespace formatting

A few of them have been manually reverted and the corresponding warning was silenced

* Simplify properties and array initialization, Use const when possible, Remove trailing commas

* Revert "Simplify properties and array initialization, Use const when possible, Remove trailing commas"

This reverts commit 9462e4136c0a2100dc28b20cf9542e06790aa67e.

* dotnet format whitespace after rebase

* First dotnet format pass

* Add trailing commas

* Fix naming and formatting issues

src/Ryujinx.Headless.SDL2/SDL2Mouse.cs

@@ -87,4 +87,4 @@ namespace Ryujinx.Headless.SDL2
             _driver = null;
         }
     }
-}
+}