Seedlet: link color overridden in the editor

[jffng]

As of Gutenberg 8.5.1, the default link color is overridden in the editor:

This perhaps has something to do with the experimental-link-color feature that was recently introduced. Disabling it doesn't solve this issue, however.

[kjellr]

Will this be fixed by #2275?

[Copons]

Will this be fixed by #2275?

Yes!
This line here is how I'm fixing it: https://github.com/Automattic/themes/pull/2275/files#diff-7031c648a477f7ce6558aea53b8a1478R20

I'm not extremely happy about increasing the specificity for such generic rule, though, but I can't think of a better way.
The Guten link color is inlined last (at least in my test environment), and so has precedence over anything else with the same specificity.
.wp-block a shouldn't be a big deal, though, considering that 1) we are targeting blocks anyway; 2) most block-specific override are generally more specific.

[jffng]

Closed by #2275.