doom-modeline: refresh bar on frame-creation

Thanking phil.catalyst from #emacs for suggesting this fix!

This should make it so modules on the right-hand side of the modeline doesn't
cut itself off. Usually, an Emacs server started won't have a GUI, so
doom-modeline doesn't actually know its width. Refreshing doom-modeline when
a new frame is created will make it aware of its width from (re)initialisation.

config/config-ui.el

@@ -2,12 +2,19 @@
 
 
 (defun config-init-ui ()
+  (defun my/doom-modeline-for-new-frames (&optional frame)
+    (setq doom-modeline-height (+ (frame-char-height) 8))
+    (with-selected-frame (or frame (selected-frame))
+      (doom-modeline-refresh-bars)))
+
   (use-package doom-modeline
     :defer t
     :commands (doom-modeline-mode)
     :custom
     (doom-modeline-mode t)
-    (doom-modeline-env-load-string ""))
+    (doom-modeline-env-load-string "")
+    (doom-modeline-height (+ (frame-char-height) 8))
+    :hook (after-make-frame-functions . my/doom-modeline-for-new-frames))
 
   (use-package base16-theme
     :config