Yaru: Record icon could be white instead of red

[Feichtmeier]

Noticed that the adwaita icon is white, which looks better on red record buttons :)

@ubuntujaggers thoughts? :)

[meetdilip]

Perhaps a white outline to the red button.

[clobrano]

Better full white for me 👍

[ubuntujaggers]

I agree, will do this soon 👍