Add small amount of padding above log table

This is needed so that the highlight around the "number of rows per
page" dropdown isn't cut off at the top on the session detail page.

quicktill/tillweb/templates/tillweb/loglist.html

@@ -1,5 +1,5 @@
 {% if logs %}
-<div class="table-responsive mb-2">
+<div class="table-responsive mb-2 pt-1">
 <table class="table table-striped table-hover table-sm" id="logs">
   <thead class="thead-light">
     <tr>