refactor(sterni/mblog/mail-note): make dependency on config explicit

We reuse the common buffer size setting from mblog for convenience.
Eventually we probably want to make mail-note an independent library, so
it's good to make this internal dependency explicit and not a blanket
USE-PACKAGE, so the amount of used symbols from config doesn't increase.

Change-Id: I88458493c90d9f52410e34ed2a1db99be751b901
Reviewed-on: https://cl.tvl.fyi/c/depot/+/12914
Reviewed-by: sterni <sternenseemann@systemli.org>
Autosubmit: sterni <sternenseemann@systemli.org>
Tested-by: BuildkiteCI

users/sterni/mblog/mail-note/note.lisp

@@ -9,7 +9,7 @@
 (defun html-escape-stream (in out)
   "Escape characters read from stream IN and write them to
   stream OUT escaped using WHO:ESCAPE-STRING-MINIMAL."
-  (let ((buf (make-string config:*general-buffer-size*)))
+  (let ((buf (make-string *general-buffer-size*)))
     (loop for len = (read-sequence buf in)
           while (> len 0)
           do (write-string (who:escape-string-minimal (subseq buf 0 len)) out))))

users/sterni/mblog/packages.lisp

@@ -22,8 +22,8 @@
    :common-lisp
    :closure-html
    :cl-date-time-parser
-   :mime4cl
-   :config)
+   :mime4cl)
+  (:import-from :config :*general-buffer-size*)
   (:import-from
    :alexandria
    :when-let*