Bug 1868613 body font size inheriting from somewhere else

Body was inheriting styles that wasn't intended for it, removed it
so increasing base font size variable can work.

There was a bunch of things relating to adding a block via commit
18bab028

The other bits were removed by commit
6cee4292
when we changed how we add a block to a page

But one sass/css bit was left so will remove now

behatnotneeded

Change-Id: I65698e42493807eb5d044f3b9ac094e180d44ea9
(cherry picked from commit c521ffdf)

htdocs/theme/raw/sass/components/_cells.scss

 .modal .cell-radios > .form-group.radio > div.radio {
     display: none;
 }
-
-#addblock_blocklegend_container {
-    border: 0;
-    padding: 0;
-    .pieform-fieldset legend {
-        @extend body;
-        padding-top: 0;
-    }
-}