DiscIO: Remove some explicit deletes
FramebufferManager: Bind only the first framebuffer layer when the EFB only has one layer.
Merge pull request #1651 from Armada651/resolve-layer

 FramebufferManager: Bind only the first framebuffer layer when the EFB only has one layer.
Merge pull request #1652 from lioncash/delete

DiscIO: Remove some explicit deletes