Stop checking for active formats when doing delete. (#22446)

On the web this checking the active formats makes sense because you
have a mode where you are inside a selection ("active selection").
That doesn't happen on mobile so having a selection active shouldn't
block the deletion and merge.

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

@@ -315,7 +315,6 @@ export class RichText extends Component {
  const isReverse = keyCode === BACKSPACE;
 
  const { onDelete, __unstableMultilineTag: multilineTag } = this.props;
- const { activeFormats = [] } = this.state;
  this.lastEventCount = event.nativeEvent.eventCount;
  this.comesFromAztec = true;
  this.firedAfterTextChanged = event.nativeEvent.firedAfterTextChanged;
@@ -353,7 +352,6 @@ export class RichText extends Component {
  if (
  ! onDelete ||
  ! isCollapsed( value ) ||
- activeFormats.length ||
  ( isReverse && start !== 0 ) ||
  ( ! isReverse && end !== text.length )
  ) {