Relying more on default parameters for the acceleration

Originally posted by @uekerman in https://github.com/precice/tutorials/issues/640#issuecomment-2761259728:

If we touch this, I would suggest to directly switch to the default everywhere, e.g.

<acceleration:IQN-ILS>
  <data name="Displacement" mesh="Solid-Mesh" />
  <data name="Force" mesh="Solid-Mesh" />
</acceleration:IQN-ILS>

This would mean, for the perpendicular-flap case:

    <acceleration:IQN-ILS>
      <data name="Displacement" mesh="Solid-Mesh" />
      <data name="Force" mesh="Solid-Mesh" />
-      <preconditioner type="residual-sum" update-on-threshold="false" />
-      <filter type="QR2" limit="1e-2" />
-      <initial-relaxation value="0.5" />
-      <max-used-iterations value="100" />
-      <time-windows-reused value="15" />
    </acceleration:IQN-ILS>

We could revisit all tutorials and remove all non-default values, or update to newer options (e.g., use the QR3 filter in more tutorials).

This would, however, require re-validation of each tutorial that is updated (and then updating the reference results).

Compare to the defaults in https://precice.org/configuration-xml-reference.html

Start with the perpendicular-flap case and compare its XML acceleration settings with the defaults in the preCICE configuration XML reference. Review the other tutorials for non-default acceleration values, then re-validate each updated tutorial and update its reference results. Done means the examples use appropriate current defaults or options and all reference results remain valid.