Sculpt: Option to limit the forces axis in the Cloth Filter

This uses the same concept of the Mesh Filter but for applying the cloth
filter forces, so now it can be limited to a specific axis.

Reviewed By: sergey

Differential Revision: https://developer.blender.org/D8567

release/scripts/startup/bl_ui/space_toolsystem_toolbar.py

@@ -1286,6 +1286,8 @@ class _defs_sculpt:
             props = tool.operator_properties("sculpt.cloth_filter")
             layout.prop(props, "type", expand=False)
             layout.prop(props, "strength")
+            row = layout.row(align=True)
+            row.prop(props, "force_axis")
             layout.prop(props, "cloth_mass")
             layout.prop(props, "cloth_damping")
             layout.prop(props, "use_face_sets")