[sle-beta] Use correct base product name

[Knut Alejandro Anderssen González]

Cloned profiles were using a wrong base product name ("short_name").

<products config:type="list">
  <product>SLED15</product>
</products>

It has been fixed recently [1] and the documentation has been updated
accordingly [2]

Take it into account if cloned profiles are used and an error about not
product selected is reported. The profiles should use the name without
the version (SLES, SLED):

<products config:type="list">
  <product>SLED</product>
</products>


[1] https://github.com/yast/yast-autoinstallation/pull/411
[2] https://github.com/SUSE/doc-sle/pull/263

-- 
Knut Alejandro Anderssen González
YaST Team at SUSE Linux GmbH