fix(ui): fix Pill font-size (#21296)

* fix(ui): fix Pill font-size

* used theme font-size variables

Co-authored-by: Robin Rendle <robin@erskinedesign.com>

src/sentry/static/sentry/app/components/pills.tsx

@@ -3,7 +3,7 @@ import styled from '@emotion/styled';
 const Pills = styled('div')`
   display: flex;
   flex-wrap: wrap;
-  font-size: 13px;
+  font-size: ${p => p.theme.fontSizeSmall};
 `;
 
 export default Pills;