lisp/org.el: Fix indentation again

* lisp/org.el (org-indent-line): Take care of checking at the
beginning of the line.

Reported-by: Kévin Le Gouguec <kevin.legouguec@gmail.com>
Link: https://orgmode.org/list/878s4wu9oe.fsf@gmail.com/T/#m658a98441dcce099a569ca5b228778aad5d102f3

lisp/org.el

@@ -19001,6 +19001,7 @@ Also align node properties according to `org-property-format'."
   (unless (or (org-at-heading-p)
               (and (eq org-adapt-indentation 'headline-data)
                    (save-excursion
+                     (beginning-of-line 1)
                      (skip-chars-backward "\n")
                      (org-at-heading-p))))
     (let* ((element (save-excursion (beginning-of-line) (org-element-at-point)))