PCAPredict: Switched default search filter back to 'Everything'.

PCAPredict: Removed workaround to use 'Everything' search after a
'PostalCodes' search.

Removed validate function from the house number field.

Updated the postal code field validate function to prepend the house
number field value to the search term if present. This results in more
accurate results and better performance.

Tweaked error messaging on a lookup with zero results.