[BUG] 81c7a2dee8 misaligns time lines in agenda

[Adam Porter <adam@alphapapa.net>]

Hi,

In the course of working on a PR for org-super-agenda [0], we found that
a recent change to Org, commit 81c7a2dee8 [1], causes a misalignment in
the way time lines in the agenda are displayed.  The org-super-agenda
test suite shows this change when results from Org 9.4 and 9.4.6 are
compared.  For example, in this diff of an agenda buffer:

#+BEGIN_EXAMPLE diff
 @@ -2,8 +2,8 @@
 Wednesday   5 July 2017
 
  Today
-  test:        7:02...... Sunrise (12:04 of daylight)
-               8:00...... ----------------
+  test:       7:02......  Sunrise (12:04 of daylight)
+              8:00......  ----------------
               10:00...... ----------------
               12:00...... now - - - - - - - - - - - - - - - - - - - - - - - - -
               12:00...... ----------------
#+END_EXAMPLE

The old lines, with single-digit hours, were properly aligned with the
lines with multi-digit hours, but the new lines are one character too
far to the left.

Since Bastien made this change, and it's very simple, I'm guessing he'll
know what the proper fix is.  :)

Thanks,
Adam

0: https://github.com/alphapapa/org-super-agenda/pull/167
1: https://code.orgmode.org/bzg/org-mode/commit/81c7a2dee8e6d0c5e58d0cb4ca97cfc9477ff660