Remove TODO from 30-symb_lockset_mayunlock.c: race is now detected with may-equality fix

The unlock of &p2->mymutex (where p2 may be NULL or p1) now correctly removes
&p1->mymutex from the lockset via MayPointTo may-equality check, making the
subsequent p1->myint++ correctly detected as a race condition.

Agent-Logs-Url: https://github.com/goblint/analyzer/sessions/644f1b44-5460-4a93-89cf-0770892d1b67

Co-authored-by: vesalvojdani <911273+vesalvojdani@users.noreply.github.com>

Author: Copilot

tests/regression/06-symbeq/30-symb_lockset_mayunlock.c

@@ -13,7 +13,7 @@ void *foo(void *arg) {
   pthread_mutex_lock(&p1->mymutex);
   if (__VERIFIER_nondet_int()) p2 = NULL;
   pthread_mutex_unlock(&p2->mymutex);
-  p1->myint++; // TODO RACE
+  p1->myint++; // RACE
 
   return NULL;
 }