The report test selection resets when you change the benchmark

assets/scripts/reports.coffee

@@ -1,6 +1,9 @@
 $ ->
   chartInstance = null
 
+  $('#report-benchmarks').on 'change', (e) ->
+    $('#report-tests option').prop('selected', false)
+
   $('#reports-download').on 'click', (e) ->
     e.preventDefault()
     canvas = $('#benchmark-chart')[0]