video_core: read the framebuffer before recording the upscaled-output blit

BlitColor(VkImageView, VkImage, ...), which draws FSR 3.1's output into the game's DLSS output,
captured the Framebuffer pointer and read its render pass, handle and size on the worker thread.
The pointer points into the texture cache's framebuffer slots, which can be reallocated before the
worker records the command, so the render pass could begin with a stale or null render pass and
framebuffer. FSR 3.1 records quickly enough that this rarely shows; with a slower first evaluation
(NVIDIA DLSS creating its feature) it crashed in vkCmdBeginRenderPass at the first evaluation in
every run.

Read the three values on the calling thread and capture those instead. Nothing else changes.

Assisted-by: Claude Opus 5.5 (debugging, implementation)
Signed-off-by: Duck912 <350528965+Duck912@users.noreply.github.com>

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