The cloth scale Filter relies on properly set up deformation constraints
(this is done in `do_cloth_brush_build_constraints_task`).
Whenever the Brush (not the Filter) is set to `SCULPT_TOOL_CLOTH`
(having it selected prior to the filter), another code path is taken and
the setting up the proper constraints is skipped (making the Filter
disfunctional).
To distinguish between filter usage and brush usage, there were already
checks for the `StrokeCache` (indicating brush usage afaict), so to
resolve, use the same check to prevent entering the particular code path
associated with the `SCULPT_TOOL_CLOTH`.
Probably an oversight in c2f0522760
Pull Request: https://projects.blender.org/blender/blender/pulls/122440
7a11fad380