Twenty Twenty: Wrong Text Color for Background Color & Subtle Background when used as background color for blocks

[collet]

To reproduce the issue:

• In the customizer inside the Colors panel set the Background Color to #000, it will generate a white text color
• In the editor, insert a block that supports background color (e.g. Paragraph) and select Background Color or Subtle Background as the background color using the color palette.

The text color is black instead of white, which makes the text unreadable.

The issue (front-end and editor) is caused by the CSS (which set the text to black) at the following lines:

• style.css line 2730​
• style.css line 2739​
• editor-style-block.css line 198​
• editor-style-block.css line 207​