i965/copy_image: Use the correct texture level

i965/copy_image: Use the correct texture level

Previously, we were using the source images level for both source and
destination.  Also, we weren't taking the MinLevel from a potential texture
view into account.  This commit fixes both problems.

Signed-off-by: Jason Ekstrand <jason.ekstrand@intel.com>
Cc: "10.3" <mesa-stable@lists.freedesktop.org>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=82804
Tested-by: Tapani Pälli <tapani.palli@intel.com>
Reviewed-by: Matt Turner <mattst88@gmail.com>