[DO NOT MERGE] [RNMobile] Update block inserter button

[SiobhyB]

This PR has been created purely for the purposes of generating an installable build. It's not intended to be merged.

Please refer to the related Gutenberg PR for further details: WordPress/gutenberg#39726

[wpmobilebot]

You can test the changes in Jetpack from this Pull Request by:

• Clicking here or scanning the QR code below
• Then installing the build number pr18233-1c58996 from App Center on your iPhone

The .ipa file can also be downloaded directly here.
If you need access to App Center, please ask a maintainer to add you.

[wpmobilebot]

You can test the changes in WordPress from this Pull Request by:

• Clicking here or scanning the QR code below
• Then installing the build number pr18233-1c58996 from App Center on your iPhone

The .ipa file can also be downloaded directly here.
If you need access to App Center, please ask a maintainer to add you.

[peril-wordpress-mobile]

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