Fix Issue #6105 regarding drop cap-related display error

[twsp]

Description

I removed the "overflow: hidden" property that was being applied to blocks with drop caps when they were not in focus. This code was causing text to not properly wrap, as described in issue #6105, and did not seem to have any other effects in other situations unrelated to the issue.

Fixes #6105

How Has This Been Tested?

I tested this by recreating the problem with the steps in the aforementioned issue, changing the code, and ensuring that it had the desired effect without any unintended consequences.

Screenshots (jpeg or gifs if applicable):

This is how the text looked when out of focus before the issue was fixed:

This is how it looks when out of focus after the fix:

Types of changes

This is a bug fix.

Checklist:

• My code is tested.
• My code follows the WordPress code style.
• My code has proper inline documentation.

[danielbachhuber]

The overflow:hidden appears to have come out of 8dfc4c5, which was introduced in #1418.

Based on that PR though, it's not super clear where the original dropcap CSS is from. @BE-Webdesign Do you recall?

[aduth]

It appears this was addressed separately in #6359. Thanks for the contribution all the same!