Fix annotate hash regexp

Dependencies

• [2] CJQZS55X working annotation
• [3] MAGPFPZB init

Change contents

• replacement in vc-darcs.el at line 524
  [2.4674]→[2.4674:4738](∅→∅)
  − (while (looking-at "^\\([-0-9a-f]+\\)\\.gz | \\(.*\\)$")
  [2.4674]

  [2.4738]
  + (while (looking-at "^\\([-0-9a-f]+\\)\\(?:\\.gz\\)? | \\(.*\\)$")