enforce better defaults for origin macro
enforce better defaults for origin macro

when using
<<view field SiteIcon>>
<<originMacro>>

currently the following parameters are commonly used:
label:no spaceLink:yes height:48 width:48 preserveAspectRatio:yes

It would be more useful to omit these parameters.

FND/tiddlyspace,FND/tiddlyspace,TiddlySpace/tiddlyspace,TiddlySpace/tiddlyspace,TiddlySpace/tiddlyspace,FND/tiddlyspace