Match Codecov UI inline styling

[codecovdesign]

Problem to solve

Today in the Codecov app we have the following indications for inline coverage:

• Not covered: solid red + red highlight
• Partial: dotted yellow + yellow highlight
• Covered: green highlight

The browser extension has:

• Not covered: red highlight
• Covered: solid green + green highlight

Solution

Update browser extension to consistent inline reporting as seen in-app to align.