Remove slob-related checks in grade.sh

These checks should no longer exist after simplification.

Signed-off-by: Junjie Mao <eternal.n08@gmail.com>

labcodes/lab8/tools/grade.sh

@@ -347,7 +347,6 @@ default_check() {
     'PDE(001) fac00000-fb000000 00400000 -rw'                   \
     '  |-- PTE(000e0) faf00000-fafe0000 000e0000 urw'           \
     '  |-- PTE(00001) fafeb000-fafec000 00001000 -rw'		\
-    'check_slob() succeeded!'					\
     'check_vma_struct() succeeded!'                             \
     'page fault at 0x00000100: K/W [no page found].'            \
     'check_pgfault() succeeded!'                                \