VideoConfig: Remove bForceCopyToRam field

It's the inverse of supports-copy-to-vram.

Source/Core/VideoBackends/Vulkan/VulkanContext.cpp

@@ -246,7 +246,6 @@ void VulkanContext::PopulateBackendInfo(VideoConfig* config)
   config->backend_info.bSupportsBPTCTextures = false;              // Dependent on features.
   config->backend_info.bSupportsReversedDepthRange = false;  // No support yet due to driver bugs.
   config->backend_info.bSupportsCopyToVram = true;           // Assumed support.
-  config->backend_info.bForceCopyToRam = false;
   config->backend_info.bSupportsFramebufferFetch = false;
 }