[RNMobile] Fix: Add default value to format when start and end are un…

…defined (#22741)

* add default vale to format when start and end are undefined

* revert lint changes

packages/rich-text/src/component/index.native.js

@@ -178,7 +178,7 @@ export class RichText extends Component {
  }
 
  onFormatChange( record ) {
- const { start, end, activeFormats = [] } = record;
+ const { start = 0, end = 0, activeFormats = [] } = record;
  const changeHandlers = pickBy( this.props, ( v, key ) =>
  key.startsWith( 'format_on_change_functions_' )
  );