[Ryujinx.Graphics.Nvdec.FFmpeg] Address dotnet-format issues (#5370)

* dotnet format style --severity info

Some changes were manually reverted.

* 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

* Address IDE0251 warnings

* 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

src/Ryujinx.Graphics.Nvdec.FFmpeg/Native/AVPacket.cs

@@ -1,26 +1,24 @@
-using System;
-
-using AVBufferRef = System.IntPtr;
+using AVBufferRef = System.IntPtr;
 
 namespace Ryujinx.Graphics.Nvdec.FFmpeg.Native
 {
     struct AVPacket
     {
-#pragma warning disable CS0649
-        public unsafe AVBufferRef *Buf;
+#pragma warning disable CS0649 // Field is never assigned to
+        public unsafe AVBufferRef* Buf;
         public long Pts;
         public long Dts;
         public unsafe byte* Data;
         public int Size;
         public int StreamIndex;
         public int Flags;
-        public IntPtr SizeData;
+        public AVBufferRef SizeData;
         public int SizeDataElems;
         public long Duration;
         public long Position;
-        public IntPtr Opaque;
-        public unsafe AVBufferRef *OpaqueRef;
+        public AVBufferRef Opaque;
+        public unsafe AVBufferRef* OpaqueRef;
         public AVRational TimeBase;
 #pragma warning restore CS0649
     }
-}
+}