textures/decoders: Fix block linear to pitch copies

There were two issues with block linear copies. First the swizzling was
wrong and this commit reimplements them.

The other issue was that these copies are generally used to download
render targets from the GPU and yuzu was not downloading them from
host GPU memory unless the extreme GPU accuracy setting was selected.
This commit enables cached memory reads for all accuracy levels.

- Fixes level thumbnails in Super Mario Maker 2.

src/video_core/textures/decoders.h

@@ -48,9 +48,8 @@ void SwizzleSubrect(u32 subrect_width, u32 subrect_height, u32 source_pitch, u32
                     u32 block_height_bit, u32 offset_x, u32 offset_y);
 
 /// Copies a tiled subrectangle into a linear surface.
-void UnswizzleSubrect(u32 subrect_width, u32 subrect_height, u32 dest_pitch, u32 swizzled_width,
-                      u32 bytes_per_pixel, u8* swizzled_data, u8* unswizzled_data, u32 block_height,
-                      u32 offset_x, u32 offset_y);
+void UnswizzleSubrect(u32 line_length_in, u32 line_count, u32 pitch, u32 width, u32 bytes_per_pixel,
+                      u32 block_height, u32 origin_x, u32 origin_y, u8* output, const u8* input);
 
 /// @brief Swizzles a 2D array of pixels into a 3D texture
 /// @param line_length_in  Number of pixels per line