This patch enables the paint brush cursor with all tools in sculpt mode,
even with the ones that are not brushes. The motivations for this change
are:

• The filters are using the position of the active vertex for certain features without any visualization of what the active vertex is.

• You can call operators like mask expand (which depends on the brush cursor position and active vertex) with a non brush tool enabled.

• Having the cursor in the rest of the tools allows to have a scene scale representation of the radius and a direct control of radius and strength (using the current brush shortcuts), which will allow to make features more intuitive without relying on modifying values in the topbar. For example, the brush radius can be used to control the depth of the cut in the trimming tools or the size of the sphere in the sphere mesh filter