Fix the case where there is whitespace before the special > in verse

Any whitespace before the special > char in verse block is now ignored
as expected.

Ref:
02f4372

ox-blackfriday.el

@@ -1106,7 +1106,7 @@ contextual information."
          ;; Org removes all the leading whitespace only from the first
          ;; line.  So the trick is to use the ">" character before any
          ;; intended indentation on the first non-blank line.
-         (ret (replace-regexp-in-string "\\`\\([[:blank:]\n\r]*\\)>" "\\1" ret))
+         (ret (replace-regexp-in-string "\\`\\([[:blank:]\n\r]*?\\)[[:blank:]]*>" "\\1" ret))
          (br (org-html-close-tag "br" nil info))
          (re (format "\\(?:%s\\)?[ \t]*\n" (regexp-quote br)))
          ;; Replace each newline character with line break.  Also

test/site/content-org/all-posts.org

@@ -3617,23 +3617,23 @@ removed when translating to Markdown.
 *** More examples
 - More indentation than in the above example:
   #+begin_verse
->        Text indented by 8 spaces
-#+end_verse
+  >        Text indented by 8 spaces
+  #+end_verse
 - Leading blank line followed by indented text:
   #+begin_verse
 
->    Text indented by 4 spaces
-#+end_verse
+  >    Text indented by 4 spaces
+  #+end_verse
 - Indented text followed by a trailing blank line:
   #+begin_verse
->    Text indented by 4 spaces
+  >    Text indented by 4 spaces
 
-#+end_verse
+  #+end_verse
 - Using tab characters for indentation; each tab character still
   constitutes for one = = in HTML.
   #+begin_verse
->				Text indented by 4 tab characters
-#+end_verse
+  >				Text indented by 4 tab characters
+  #+end_verse
 *** Corner cases
 Only the *first* =>= character immediately following spaces and empty
 lines will be removed: