fix(wpcarro/emacs): Ensure laptop battery shows in modeline

TL;DR:
- support marcus and diogenes in device.el
- define and consume device-laptop? fn

Change-Id: Ia6e1c2666cbd668466ef6b64a7c274d36b79d699
Reviewed-on: https://cl.tvl.fyi/c/depot/+/4392
Tested-by: BuildkiteCI
Reviewed-by: wpcarro <wpcarro@gmail.com>

users/wpcarro/emacs/.emacs.d/wpc/wpc-ui.el

@@ -158,10 +158,9 @@
   :config
   (setq alert-default-style 'notifier))
 
-;; TODO: Should `device-work-laptop?' be a function or a constant that gets set
+;; TODO: Should `device-laptop?' be a function or a constant that gets set
 ;; during initialization?
-(when (device-work-laptop?)
-  (laptop-battery-display))
+(when (device-laptop?) (laptop-battery-display))
 
 (if window-system
     (progn