Fix typo for the allowed tags global.

[theskinnyghost]

Description of the Change

Fixed a typo in global keyword $allowedtags.

Alternate Designs

n/a

Benefits

Content in admin notices will be escaped properly.

Possible Drawbacks

None.

Verification Process

I was type-hinting the apply_filters( 'wp_kses_allowed_html', $context, 'explicit' ); filter to accept string|array and PHP did throw a Fatal Error because of this typo.
Fixing the typo also fixed this error.
See https://developer.wordpress.org/reference/functions/wp_kses_allowed_html/#source

Checklist:

• I have read the CONTRIBUTING document.
• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my change.
• All new and existing tests passed.

Applicable Issues

n/a

Changelog Entry

Fix: Fix typo for the $allowedtags global used in conjunction with wp_kses