search: quick fix for queries with leading space

* Strips leading/trailing white space from `p` argument to `/search`.
  This quick-fixes queries like `/search?p=+ellis` that were otherwise
  leading to "Showing records 1 to 0 out of 0 results" situations.

Signed-off-by: Tibor Simko <tibor.simko@cern.ch>
base: admin drop-down menu fix

* Removes the drop-down menu from the "Admin" tab in page header.
  (addresses #2246)

Signed-off-by: Eirini Psallida <eirini.psallida@cern.ch>