test_sample.rb go_to_set click first cell

Watir was clicking on the get_results link (in the centre or the rows)
which was causing issues with the tests. Clicking the first cell of the
line ensures that no link is being clicked.

server/web2py/applications/vidjil/tests/functional/test_sample.rb

@@ -30,7 +30,7 @@ class TestSample < BrowserTest
     lines = table.tbody.rows
     lines[index].wait_until_present
     # select first patient
-    lines[index].click
+    lines[index].td(:index => 0).click
     Watir::Wait.until(30) {$b.execute_script("return jQuery.active") == 0}
     # check that list of samples is loaded
     table = $b.table(:id => "table")