Regedit : Load/Unload hive incorrect menu

reactos-bootcd-0.4.15-dev-6826-gdabb3f4-x86-gcc-lin-dbg

• Open Regedit
• Go to HKEY_CURRENT_CONFIG\Software
• File > Unload hive
• Fails. This menu shall only be available for "HKEY_LOCAL_MACHINE and HKEY_USERS" (see expected result below)

REGRESSION, guilty commit :  introduced in 0.4.15-dev-243-g4d1cd72 by https://github.com/reactos/reactos/commit/4d1cd723175c25a76c17f58cb93f4e83dfd8881c 
(See PR discussion about De Morgan's law with katayama_hirofumi_mz : https://github.com/reactos/reactos/pull/2733#discussion_r422676836 )

(ntoskrnl/config/cmapi.c:2218) Key is not a hive root key!

err:(win32ss/user/user32/windows/messagebox.c:1048) MessageBox: L"The parameter is incorrect.\r\n" 

In similar siatuation, action is greyed out in W2K3 Regedit

Guilty code : https://git.reactos.org/?p=reactos.git;a=blob;f=base/applications/regedit/childwnd.c;hb=6c93f3ca6b95fa5e1806fc29295d3bc8ada979f9#l275

Expected result :

See : https://www.serverbrain.org/solutions-2003/loading-and-unloading-hive-files.html

Loading and unloading hives affects only HKEY_LOCAL_MACHINE and HKEY_USERS, and you can perform these actions only when one of these root keys is selected. Rather than replacing the selected root key, the hive you are loading then becomes a subkey of that root key. HKEY_LOCAL_MACHINE and HKEY_USERS are of course used to build all the logical root keys used on a system, so you could in fact work with any area of the Registry.

Fixed by regedit_loadfix.patch