This makes all the related errors in the log files go away:
...
prof: ERR: Color: bad color name black_bold_default
prof: ERR: Unable to load colour theme
...
Fixes https://github.com/profanity-im/profanity/issues/1810
Users where under the impression that you can't colour the time displayed
in the statusbar.
Let's add it to the template, and also change all themes to use the same
colour for the time as for the statusbar text.