Inbox WinML tests fail because Inbox loads binaries from system32 (#4660)
* make dml and onnxruntime system32 only when winml and onnxruntime is loaded from system32
* use __ImageBase as that will not incur the unsupport store api call into GetModuleHandleEx
* remove accidental comment
Co-authored-by: Sheil Kumar <sheilk@microsoft.com>