F-521: fix string bad conversion

[frousselet]

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Description

Fix issue where attribute types are wrong in opennebula_marketplace_appliance

References

#521

New or Affected Resource(s)

• opennebula_marketplace_appliance

Checklist

• I have created an issue and I have mentioned it in References
• My code follows the style guidelines of this project (use go fmt)
• My changes generate no new warnings or errors
• I have updated the unit tests and they pass succesfuly
• I have commented my code, particularly in hard-to-understand areas
• I have updated the documentation (if needed)
• I have updated the changelog file