UX Suggestion/Better Defaults: Increase default mass of eraser tool

Summary:

Currently, the eraser tool has a default mass (inertia) of 0. This creates some problematic results upon usage (see Image below). I think it will be better to have the mass set to a higher value (eg.2/3). Related to #90 (Better Defaults)

Steps to reproduce:

open Inkscape
Create a rectangle using rectangle tool
Use eraser tool (check if mass = 0)
Erase part of the rectangle to get a wavy pattern

What happened?

End result is not as smooth as one might expect (image attached)

What should have happened?

Smoother wavy parts

Sample attachments:

Version info

Inkscape 1.2-dev (73d332d, 2021-07-08)

    GLib version:     2.68.3
    GTK version:      3.24.29
    glibmm version:   2.66.1
    gtkmm version:    3.24.5
    libxml2 version:  2.9.12
    libxslt version:  1.1.34
    Cairo version:    1.17.4
    Pango version:    1.48.6
    HarfBuzz version: 2.8.1

    OS version:       Windows 10 1903