fix(ios): make default set black text on iOS 13 too

[jcesarmobile]

Platforms affected

ios

Motivation and Context

Closes #148

Description

on iOS 13, default depends on the device mode.
This PR forces default to always black.

Testing

Tested on iOS 13 device and iOS 11 device on Xcode 10 and 11

Checklist

• I've run the tests to see all new and existing tests pass
• I added automated test coverage as appropriate for this change
• Commit is prefixed with (platform) if this change only applies to one platform (e.g. (android))
• If this Pull Request resolves an issue, I linked to the issue in the text above (and used the correct keyword to close issues using keywords)
• I've updated the documentation if necessary

[danielehrhardt]

Nice!! Should be merged

[rojasss11]

Thank you @jcesarmobile . It solved my problem.
Pls, merge the request.

[timbru31]

LGTM, although I haven't done any tests.

[tymarats]

Any chance this could be released?