Fix insertion of text from hex numbers

Using `insert` directly makes use of character conversion and may scramble the
byte when inserting into the buffer (indeed, `insert` does not seem to insert
the byte, but the characters whose code-points is given in the string; same for
`insert-char`).

site-lisp/db-utils.el

@@ -181,7 +181,8 @@ the result in the minibuffer."
     (if (use-region-p)
         (progn
           (delete-region (region-beginning) (region-end))
-          (insert result))
+          (dolist (char (string-to-list result))
+            (insert-byte char 1)))
       (message result))))
 
 (defun db/text-to-hex (text-string)