[Ryujinx.Input] Address dotnet-format issues (#5384)

* 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 dotnet format CA1816 warnings

* 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

* Add comments to disabled warnings

* 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

* Remove redundant code, convert to auto-properties and fix naming rule violations

* Remove bogus change

* Address review feedback

src/Ryujinx.Input/Assigner/KeyboardKeyAssigner.cs

@@ -5,7 +5,7 @@ namespace Ryujinx.Input.Assigner
     /// </summary>
     public class KeyboardKeyAssigner : IButtonAssigner
     {
-        private IKeyboard _keyboard;
+        private readonly IKeyboard _keyboard;
 
         private KeyboardStateSnapshot _keyboardState;
 
@@ -47,4 +47,4 @@ namespace Ryujinx.Input.Assigner
             return !ShouldCancel() ? keyPressed : "";
         }
     }
-}
+}