fix(filmstrip): bring down height to avoid electron drag area

css/filmstrip/_vertical_filmstrip.scss

     display: flex;
     flex-direction: column-reverse;
     height: 100%;
-    padding: 10px 5px;
+    padding: 20px 5px 10px;
     /**
      * fixed positioning is necessary for remote menus and tooltips to pop
      * out of the scrolling filmstrip. AtlasKit dialogs and tooltips use