Use fake backbuffer format for image view

renderdoc/driver/vulkan/vk_replay.cpp

@@ -369,7 +369,7 @@ void VulkanReplay::InitDebugData()
 	VkImageViewCreateInfo bbviewInfo = {
 		VK_STRUCTURE_TYPE_IMAGE_VIEW_CREATE_INFO, NULL,
 		fakeBBIm, VK_IMAGE_VIEW_TYPE_2D,
-		VK_FORMAT_R8G8B8A8_UNORM,
+		(VkFormat)fakeBBfmt.rawType,
 		{ VK_CHANNEL_SWIZZLE_R, VK_CHANNEL_SWIZZLE_G, VK_CHANNEL_SWIZZLE_B, VK_CHANNEL_SWIZZLE_A },
 		{ VK_IMAGE_ASPECT_COLOR, 0, 1, 0, 1, }
 	};