Remove type from WidgetProps (rjsf-team#1826)

See MLH-Fellowship#37 (comment). It looks like `type` is never passed down to widgets (see, for example, https://github.com/rjsf-team/react-jsonschema-form/blob/626eb843b74cb14fa35f079ba26a8685ce0d1c3b/packages/core/src/components/fields/ArrayField.js#L560), and it's also [not documented](https://github.com/sempostma/react-jsonschema-form/blob/995480322651928607e1ee48d850c7f1d75c4e9b/docs/advanced-customization/custom-widgets-fields.md#L122) so we should remove `type` from `WidgetProps`.

Author: epicfaace

packages/core/index.d.ts

@@ -111,7 +111,6 @@ declare module '@rjsf/core' {
  onBlur: (id: string, value: boolean | number | string | null) => void;
  onFocus: (id: string, value: boolean | number | string | null) => void;
  label: string;
- type: string;
  multiple: boolean;
  rawErrors: string[];
  }