make code font dm (codesandbox#3812)

Author: SaraVieira

packages/app/src/app/pages/Sandbox/Editor/Workspace/screens/Comments/Dialog/Code.tsx

@@ -29,6 +29,7 @@ export const Code = withTheme(({ value, language, theme }) => (
               whiteSpace: 'pre-wrap',
               maxHeight: 400,
               overflow: 'scroll',
+              fontFamily: "'dm', menlo, monospace",
 
               '*': {
                 wordBreak: 'break-all',