NTObjects Space: " RegOpenKeyExW failed for path xxx" and no menu if right click on registry entry

reactos-bootcd-0.4.16-dev-847-g386fccd-x86-gcc-lin-dbg

Similar to CORE-20038

• NTObjects Space in Explorer, with "Folder view"
• Navigate to \REGISTRY\MACHINE\SOFTWARE\ReactOS\ReactOS\CurrentVersion\IFS\

• Right click on a registry key
• Fails with : 

MessageSFVCB unimplemented 17 00000001 00000000

err:(dll/shellext/ntobjshex/ntobjenum.cpp:334) RegOpenKeyExW failed for path \REGISTRY\MACHINE\SOFTWARE\ReactOS\ReactOS\CurrentVersion\IFS\BtrFS with status=c0000034 

Related code : https://git.reactos.org/?p=reactos.git;a=blob;f=dll/shellext/ntobjshex/ntobjenum.cpp#l326

Likely due to the fact that RegOpenKeyExW is callse with "\REGISTRY\MACHINE\SOFTWARE\ReactOS\ReactOS\CurrentVersion\IFS\BtrFS" and not "\MACHINE\SOFTWARE\ReactOS\ReactOS\CurrentVersion\IFS\BtrFS" (eg : leading \REGISTRY should likely not be there)