F fix max dropdown options

Summary

Fix for #345 (closed). Send the correct query string in case of BUILD_MAX_EDIT_MODE_DROPDOWN_OPTIONS=-1.

Focus

The original problem was that unlimited dropdown options would result in a P0L-1 query being sent, so this is now caught specifically.

Test Environment

Start LinkAhead with BUILD_MAX_EDIT_MODE_DROPDOWN_OPTIONS=-1 (i.e., default) and enter several hundred records, e.g., by

import linkahead as db
rt = db.RecordType(name="Test").insert()
db.Container().extend([db.Record(name=f"Rec{ii+1}").add_parent(rt) for ii in range(500)]).insert()

then, add Test as a reference prop to any entity and verify that all 500 records can be selected.

As a comparison, repeat for BUILD_MAX_EDIT_MODE_DROPDOWN_OPTIONS=10 and verify that it stops correctly after the first 10 entries and offers the possibility to enter an id manually.

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