After clicking Show More in the Repository Browser don't fetch logs_tree for files already present on page

Objective

In the repository browser, when listing a folder's content and it hits the limit upon which we truncate the list and display a show more button:

When "Show more" is clicked we re-request all log-tree entries from offset 0 even though it has already been loaded, a more efficient implementation would be to only request from where the offset previously stopped.

— @jerasmus in #332432 (comment 597911291)

Context

As follow up to the work we did for #332432 (closed) this continues to improve the unnecessary requests the app is doing.