slapos_accounting: export module business application

master/bt5/slapos_accounting/ModuleTemplateItem/cloud_contract_module.xml

 <module>
+ <category_list>
+  <category>business_application/slapos</category>
+ </category_list>
  <id>cloud_contract_module</id>
  <permission_list>
   <permission type='tuple'>

master/bt5/slapos_accounting/ModuleTemplateItem/consumption_document_module.xml

 <module>
+ <category_list>
+  <category>business_application/slapos</category>
+ </category_list>
  <id>consumption_document_module</id>
  <permission_list>
   <permission type='tuple'>