headless: fix vulkan exclusive fullscreen ignored

Running in headless mode under wayland (e.g. Sway) compositor, it's not
possible to set any resolution other than 1280x720.

This is because Ryujinx was not updating default surface dimension when
creating swapchain.

src/Ryujinx.Graphics.Gpu/Shader/ShaderSpecializationState.cs

@@ -743,7 +743,7 @@ namespace Ryujinx.Graphics.Gpu.Shader
                 constantBufferUsePerStageMask &= ~(1 << index);
             }
 
-            if (checkTextures && _allTextures.Length > 0)
+            if (checkTextures)
             {
                 TexturePool pool = channel.TextureManager.GetTexturePool(poolState.TexturePoolGpuVa, poolState.TexturePoolMaximumId);
 

src/Ryujinx.Headless.SDL2/Vulkan/VulkanWindow.cs

@@ -44,11 +44,9 @@ namespace Ryujinx.Headless.SDL2.Vulkan
                 {
                     Logger.Warning?.Print(LogClass.Application, $"Could not retrieve display bounds: {SDL_GetError()}");
                 }
-                else
-                {
-                    width = displayBounds.w;
-                    height = displayBounds.h;
-                }
+
+                width = displayBounds.w;
+                height = displayBounds.h;
             }
 
             Renderer?.Window.SetSize(width, height);