[video_core] Partial Revert #3246 to Improve Performance (#3456)

Improves performance and stuttering in MP4 noticeable on the Steamdeck.
https://git.eden-emu.dev/eden-emu/eden/pulls/3456#issuecomment-19064

LM3 Fixed in #3457
Attempt to fix a flickering issue noticed with LM3
<video src="/attachments/6bf12c4b-a67b-469a-9806-db8390be02ff" title="Flicker" controls></video>

Co-authored-by: crueter <crueter@eden-emu.dev>
Reviewed-on: https://git.eden-emu.dev/eden-emu/eden/pulls/3456
Reviewed-by: MaranBr <maranbr@eden-emu.dev>
Reviewed-by: Maufeat <sahyno1996@gmail.com>
Reviewed-by: crueter <crueter@eden-emu.dev>
Co-authored-by: John <john@eden-emu.dev>
Co-committed-by: John <john@eden-emu.dev>

src/video_core/renderer_vulkan/vk_compute_pass.cpp

@@ -623,7 +623,7 @@ void ASTCDecoderPass::Assemble(Image& image, const StagingBufferRef& map,
             .sType = VK_STRUCTURE_TYPE_IMAGE_MEMORY_BARRIER,
             .pNext = nullptr,
             .srcAccessMask = VK_ACCESS_SHADER_WRITE_BIT,
-            .dstAccessMask = VK_ACCESS_SHADER_READ_BIT,
+            .dstAccessMask = VK_ACCESS_SHADER_READ_BIT | VK_ACCESS_SHADER_WRITE_BIT,
             .oldLayout = VK_IMAGE_LAYOUT_GENERAL,
             .newLayout = VK_IMAGE_LAYOUT_GENERAL,
             .srcQueueFamilyIndex = VK_QUEUE_FAMILY_IGNORED,
@@ -638,7 +638,7 @@ void ASTCDecoderPass::Assemble(Image& image, const StagingBufferRef& map,
             },
         };
         cmdbuf.PipelineBarrier(VK_PIPELINE_STAGE_COMPUTE_SHADER_BIT,
-                               VK_PIPELINE_STAGE_FRAGMENT_SHADER_BIT, 0, image_barrier);
+                               VK_PIPELINE_STAGE_ALL_COMMANDS_BIT, 0, image_barrier);
     });
     scheduler.Finish();
 }