Search bar in facets does not disappear if the number of facet values is a multiple of the pagination's page size

[AndreaBarbasso]

Describe the bug

If the number of values in a facet is a multiple of the size of each page during pagination (i.e. each page is full), the search bar below the facet values does not disappear when all the facet values are shown.

To Reproduce

Steps to reproduce the behavior:

1. Go to any search page and do a search that retrieves, for a single facet, a number of values multiple of 5.
2. Continue clicking on the "show more" button until it disappears, while the search bar does not disappear.

e.g. https://sandbox.dspace.org/search?spc.page=1&f.author=Abdominal%20and%20Paediatric%20Surgery,equals

Expected behavior

The seach bar should disappear when there are no more facet values pages to load.