Fix the search in ResultsDB
    
    Fixes few hiccups in the search implementation.
    First of all, the source for typeahead.js is changed to CDN that
    serves the data over https, instead of http (which was causing problems
    on prod).
    Also, the testcase_tokenizer endpoint works if there are multiple pages
    of testcases.
    Search form is populated with the data from the URL, if present.
    
    Differential Revision: https://phab.qa.fedoraproject.org/D1106