Removed all: unset from default styles (#658)

Author: matthewlipski

packages/core/src/editor/editor.css

@@ -36,7 +36,6 @@ Tippy popups that are appended to document.body directly
 .bn-default-styles h2,
 .bn-default-styles h3,
 .bn-default-styles li {
-  all: unset;
   margin: 0;
   padding: 0;
   font-size: inherit;