Fix field selection in SearchByExample

[rmzelle]

I haven't troubleshot this carefully, but it looks like the desired behavior is that when the cursor is in the in-line citation or bibliographic entry field, that all fields that are rendered are highlighted with a blue border in the left-hand panel.

For some items (maybe those with issued dates that consist of more than a year?) the wrong fields are highlighted. E.g. below the "Issue" field is wrongly highlighted, whereas the "Issued" isn't, but should be.

[rmzelle]

Also weird:

(2011 not highlighted)

("search" in URL wrongly highlighted; probably because matching is rather dumb)