chore(use-package): use :preface in favor of :init when defining things

modules/shell/siren-vterm.el

@@ -33,7 +33,7 @@
   (vterm-kill-buffer-on-exit t)
   (vterm-max-scrollback 50000)
 
-  :init
+  :preface
   (defun siren-vterm-mode-setup ()
     (hl-line-mode -1))
 

modules/shell/siren-xterm-color.el

@@ -11,7 +11,7 @@
   :custom
   (compilation-environment '("TERM=xterm-256color"))
 
-  :init
+  :preface
   (defun siren-advice-compilation-filter (f proc string)
     (funcall f proc (xterm-color-filter string)))