Allow date stamps to have no dame of day, in one more place

* lisp/org.el (org-ts-regexp0): Allow time stamps without name of day.

lisp/org.el

@@ -5217,7 +5217,8 @@ This should be called after the variable `org-link-types' has changed."
   "Regular expression for fast time stamp matching.")
 (defconst org-ts-regexp-both "[[<]\\([0-9]\\{4\\}-[0-9]\\{2\\}-[0-9]\\{2\\} ?[^]\r\n>]*?\\)[]>]"
   "Regular expression for fast time stamp matching.")
-(defconst org-ts-regexp0 "\\(\\([0-9]\\{4\\}\\)-\\([0-9]\\{2\\}\\)-\\([0-9]\\{2\\}\\) *\\([^]+0-9>\r\n -]*\\)\\( \\([0-9]\\{1,2\\}\\):\\([0-9]\\{2\\}\\)\\)?\\)"
+(defconst org-ts-regexp0
+ "\\(\\([0-9]\\{4\\}\\)-\\([0-9]\\{2\\}\\)-\\([0-9]\\{2\\}\\)\\( +[^]+0-9>\r\n -]+\\)?\\( +\\([0-9]\\{1,2\\}\\):\\([0-9]\\{2\\}\\)\\)?\\)"
   "Regular expression matching time strings for analysis.
 This one does not require the space after the date, so it can be used
 on a string that terminates immediately after the date.")