MDL-56321 theme_boost: Profile page adjustments

- Removed the border overlapping a user's avatar. This only affected
  course profiles and the default preset.
- Do not break the sections when they wrap from one column to another
- Sneaked in a change to remove left/right padding on .box. I've been
  wanting to change that since I added it. The padding on top and bottom
  is sometimes useful to separate boxes, but the left/right padding
  should be applied by the general structure.

theme/boost/classes/output/core_renderer.php

@@ -62,7 +62,7 @@ class core_renderer extends \core_renderer {
         if (is_array($classes)) {
             $classes = implode(' ', $classes);
         }
-        return parent::box_start($classes . ' p-a-1', $id, $attributes);
+        return parent::box_start($classes . ' p-y-1', $id, $attributes);
     }
 
     /**