[v8windbg] Fix dx @$curisolate()

Change-Id: Iea2fa346bb4d6cd34a1e3f892b9787e75f26237d
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2786681Reviewed-by: Seth Brenith <seth.brenith@microsoft.com>
Commit-Queue: Z Nguyen-Huu <duongn@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#73669}

tools/v8windbg/src/cur-isolate.h

@@ -17,7 +17,7 @@
 
 HRESULT GetCurrentIsolate(WRL::ComPtr<IModelObject>& sp_result);
 
-constexpr wchar_t kIsolateKey[] = L"isolate_key_";
+constexpr wchar_t kIsolateKey[] = L"v8::internal::Isolate::isolate_key_";
 constexpr wchar_t kIsolate[] = L"v8::internal::Isolate";
 
 class CurrIsolateAlias