[XWEM]: Adding things to xwem-tray

[Steve Youngs]

I've been looking at my screen wondering "what's missing?"... The date!
I need the date staring at me otherwise I have no idea what day of the
week it is (yes, I'm serious).

Anyway, I figure that a good place for it would be the xwem-tray.  My
attempts, so far, have been unsuccessful. :-(

(setq xwem-tray-config
      '([XWEM-TRAY-DOCK (format-time-string "%a, %b%e")]))

(xwem-tray-run-config)
=> Wrong type argument: char-or-string-p, (format-time-string "%a, %b%e")

Say what!  `format-time-string' returns a string, so why am I getting
that error?

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