* lisp/ol.el (org-store-link): Store link with CUSTOM_ID anchor
in indirect buffer.
(org-insert-link): Do not add file name to search and CUSTOM_ID
links pointed to the same file when called from indirect buffer.
When a subtree was open in an indirect buffer, wrong argument
of `abbreviate-file-name' prevented storing link to a CUSTOM_ID
anchor. Internal link to a header line or to a CUSTOM_ID anchor
was created with file name instead of concise form.
This is a follow up of 784e5f1488.
TINYCHANGE