test: also suppress BDB LSan via __os_malloc for CI stacks

depends BDB is built without frame pointers, so linux64_asan LSan reports only malloc -> __os_malloc for the known 4x160-byte wallet env leak. leak:__lock_region_init alone never matches those truncated stacks. Keep both suppressions so CI and local debug BDB builds are covered.

Author: PastaPastaPasta

test/sanitizer_suppressions/lsan

@@ -4,7 +4,9 @@ leak:QDBusConnectionPrivate
 leak:QLayoutPrivate
 leak:QDBusConnectionManager
 # Berkeley DB 4.8 DB_PRIVATE lock free-list entries (sizeof(DB_LOCKOBJ)=160)
-# allocated in __lock_region_init during env open. Some remain reachable only
-# through region state that LSan cannot attribute after env teardown on Linux
-# ASAN CI, producing a stable 4x160-byte report from wallet unit tests.
+# allocated in __lock_region_init during env open. Wallet unit tests leave a
+# stable 4x160-byte report after env teardown. depends BDB is built without
+# frame pointers, so CI LSan stacks stop at __os_malloc; local debug BDB builds
+# show __lock_region_init. Match both.
 leak:__lock_region_init
+leak:__os_malloc