Indeed, writing
#show: lq.set-tick(inset: 0pt)
would be the preferred way. I recommend separating content from styling wherever possible in order to avoid polluting the plotting code and to easily switch out styles.
Within diagram code, this is actually not possible. This is part of the design of Lilaq: we avoid repetitive arguments that are passed on and on to nested elements; instead the user can directly speak to an element through set and show rules.