Increase probability of PGM activation from 1/1000 to 1/100

https://bugs.webkit.org/show_bug.cgi?id=260362
<rdar://114042901>

Reviewed by Mark Lam.

* Source/bmalloc/libpas/src/libpas/pas_probabilistic_guard_malloc_allocator.c:
(pas_probabilistic_guard_malloc_initialize_pgm):
- Change probability from 1000 to 100.

Canonical link: https://commits.webkit.org/267366@main

Source/bmalloc/libpas/src/libpas/pas_probabilistic_guard_malloc_allocator.c

@@ -259,7 +259,7 @@ void pas_probabilistic_guard_malloc_initialize_pgm(void)
     if (!pas_probabilistic_guard_malloc_is_initialized) {
         pas_probabilistic_guard_malloc_is_initialized = true;
 
-        if (PAS_LIKELY(pas_get_fast_random(1000) >= 1)) {
+        if (PAS_LIKELY(pas_get_fast_random(100) >= 1)) {
             pas_probabilistic_guard_malloc_can_use = false;
             return;
         }