Vocab widget: don't double-encode search term before passing to SISSVoc
Vocab widget: don't double-encode search term before passing to SISSVoc

The search term was URL encoded twice before passing to SISSVoc.
So if the search term has, e.g., a space in it, this was converted
into %2520, and SISSVoc did not then find any search results.

No longer do the first URL encoding.

au-research/ANDS-Registry-Core,au-research/ANDS-Registry-Core,au-research/ANDS-Registry-Core,au-research/ANDS-Registry-Core,au-research/ANDS-Registry-Core