Revert "[scudo] Fix isOwned on MTE devices. (llvm#110717)"

This caused failures in aarch64 builders.

This reverts commit 98c9523.
(llvmorg-20-init-7659-g98c9523113b5)

Author: chapuni

compiler-rt/lib/scudo/standalone/combined.h

@@ -785,8 +785,6 @@ class Allocator {
   // A corrupted chunk will not be reported as owned, which is WAI.
   bool isOwned(const void *Ptr) {
     initThreadMaybe();
-    // If the allocation is not owned, the tags could be wrong.
-    ScopedDisableMemoryTagChecks x;
 #ifdef GWP_ASAN_HOOKS
     if (GuardedAlloc.pointerIsMine(Ptr))
       return true;