Check to simplify SpaceKey Usage in Templates

Seems to be simpler than:

<ac:parameter ac:name="spaceKey"><at:var at:name="spaceKeyElement" at:rawxhtml="true" /></ac:parameter>

Should go with:

<ac:parameter ac:name="spaceKey"><at:var at:name="spaceKey"/></ac:parameter>

See
https://answers.atlassian.com/questions/318493/how-to-render-spacekey-for-macro-in-blueprint-template