spdk_top: decrease cores tab threads width from 14 to 10

The number of threads is a relatively small number, we really only need
width to match the "Threads" column name.

Signed-off-by: Jim Harris <jim.harris@samsung.com>
Change-Id: Iad92a6e470b6bf7055cd2fa9eb811e005afcd9d9
Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/23385


Reviewed-by: Tomasz Zawadzki <tomasz.zawadzki@intel.com>
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Reviewed-by: Krzysztof Karas <krzysztof.karas@intel.com>
Community-CI: Mellanox Build Bot
Reviewed-by: Konrad Sztyber <konrad.sztyber@intel.com>