Windows: Fix bug in disabling of Windows privileges, they were comple…

…tely removed instead

This started to cause issues after latest changes to disable privileges when they are no more needed.
Because of the bug, the privileges could not be enabled again because they were wrongly removed.

src/Common/Dlgcode.c

@@ -13706,11 +13706,11 @@ BOOL SetPrivilege(LPTSTR szPrivilegeName, BOOL bEnable)
 				&tkp.Privileges[0].Luid))
 		{
 			tkp.PrivilegeCount = 1;
-			tkp.Privileges[0].Attributes = bEnable? SE_PRIVILEGE_ENABLED : SE_PRIVILEGE_REMOVED;
+			tkp.Privileges[0].Attributes = bEnable? SE_PRIVILEGE_ENABLED : 0;
 
 			bRet = AdjustTokenPrivileges(hToken, FALSE, &tkp, 0, NULL, NULL);
 			dwLastError = GetLastError ();
-			if ( ERROR_SUCCESS != dwLastError)
+			if (bRet && (ERROR_NOT_ALL_ASSIGNED == dwLastError))
 			{
 				bRet = FALSE;
 			}