[RNMobile]Fix layout issue in Shortcode

[chipsnyder]

Description

Removed a workaround introduced by #19848 The original change was put in place due to a React Native bug. Manufacturers don't universally honor the flags to hide the autocomplete toolbar with autocomplete disabled. For example, Google devices running API 26 and below will honor the flag, where devices running API 27 and above won't.

Fixes: wordpress-mobile/gutenberg-mobile#1868
Related PR's
gutenberg-mobile: wordpress-mobile/gutenberg-mobile#1872

How has this been tested?

1.) Select a shortcode block
2.) Type enough text to wrap to a second line or more

Expect:

• Text input to grow with content
• The device should not automatically force an autosuggest change.
• Some devices/APIs won't show the prompt at all.

3.) Delete text
Expect:

• Text input to shrink with content

4.) Paste content
Expect:

• Text input to grow with content
• The text should have similar wrapping as a prefilled block.

Screenshots

Types of changes

Fixes: wordpress-mobile/gutenberg-mobile#1868

Checklist:

• My code is tested.
• My code follows the WordPress code style.
• My code follows the accessibility standards.
• My code has proper inline documentation.
• I've included developer documentation if appropriate.
• I've updated all React Native files affected by any refactorings/renamings in this PR.

[geriux]

LGTM! Tested following the cases in the description 🎉