fix(devtools): Fix progressively smaller font size for Explorer (TanStack#2886)

Fix progressively smaller font size for Explorer entries in devtools
Set Entry font-size to 1em, because it is indented multiple time within each other.
This causes the font to get smaller and smaller as `em` is relative to the parent font size.

Author: emzoumpo

src/devtools/Explorer.tsx

@@ -6,7 +6,7 @@ import { styled } from './utils'
 
 export const Entry = styled('div', {
   fontFamily: 'Menlo, monospace',
-  fontSize: '0.9em',
+  fontSize: '1em',
   lineHeight: '1.7',
   outline: 'none',
   wordBreak: 'break-word',