Fixed two tests: increased have_at_most value

@ndushay
1) advanced search pub info subject 'soviet union and historiography' and pub info '1910-1911 pub info 2010
     Failure/Error: resp.should have_at_most(136500).results
       expected at most 136500 results, got 136594
     # ./spec/advanced_search_spec.rb:339:in `block (4 levels) in <top (required)>'

  2) Korean: Unigram Searches title  창 (window) behaves like expected result size title search has between 550 and 620 results
     Failure/Error: resp.should have_at_most(max).results
       expected at most 620 results, got 622
     Shared Example Group: "expected result size" called from ./spec/cjk/korean_unigram_spec.rb:8
     # ./spec/support/shared_examples_cjk.rb:8:in `block (2 levels) in <top (required)>'