We have two different star ratings (again)

[helen]

Previously: #20655, #31424.

The star ratings on plugin install and theme details have diverged again, this time in both markup and color. It appears that we neglected to update the theme details one in #31424. I think the markup may necessarily need to be different as they are a PHP function and a JS template respectively, but we should at least consistently use the .star-rating class - right now themes.css has a woefully underqualified .rating class that causes some side effects elsewhere (links, which people may not notice anymore, but it's still there).

[helen]

32782.diff​ is a fairly minimal change that doesn't try to normalize the actual markup besides the .rating class becoming .star-rating. Also does some clean up for the full star CSS. I had to remove the spaces between the spans for theme ratings because they are visible and space the stars out more than in plugins. Now both look as plugins currently does. Some before shots of themes and plugins:

[obenland]

In 33073:

Synchronize star ratings of themes and plugins.

Makes themes ratings look like plugins ratings already do.

Props helen.
Fixes #32782.