remove obsolete @ts-ignore

Author: dcastil

packages/editor/src/Theme/Colors.tsx

@@ -1,6 +1,5 @@
 /** @jsx jsx */
 import { jsx, useThemeUI } from 'theme-ui'
-// @ts-ignore: Remove @ts-ignore after @theme-ui/style-guide was transformed to TypeScript
 import { ColorPalette } from '@theme-ui/style-guide'
 import ColorPicker from '../ColorPicker'
 import { EditorContextValue } from '../types'