[Rendering] Fix graphics pipeline not being cached;

Author: LittleCodingFox

Engine/Staple.Core/Rendering/RenderSystem/Backend/IRendererBackend.cs

@@ -1,5 +1,4 @@
 using System;
-using System.Collections.Generic;
 
 namespace Staple.Internal;
 

Engine/Staple.Core/Rendering/RenderSystem/Backend/Impls/SDLGPU/SDLGPURendererBackend.cs

@@ -693,6 +693,8 @@ vertex.layout is not SDLGPUVertexLayout vertexLayout ||
                         };
 
                         pipeline = SDL.SDL_CreateGPUGraphicsPipeline(device, in info);
+
+                        graphicsPipelines.Add(hash, pipeline);
                     }
                 }
             }

Engine/Staple.Core/Rendering/Windowing/RenderWindow.cs

@@ -537,7 +537,7 @@ internal void InitializeRenderer()
 
                 unsafe
                 {
-                    ok = RenderSystem.Backend.Initialize(renderer, true, window, renderFlags);
+                    ok = RenderSystem.Backend.Initialize(renderer, false, window, renderFlags);
 
                     if (ok)
                     {