Materializecss: Fix issues in paths

[Finii]

[why] The glyph is extremely complex with very thin open spaces and bridges. Obviously a conversion from some colored icon, without QC afterwards.

[how] Remove all the small crevices, smoothen the surface carefully and make too thin strokes a bit wider.

We still keep the Devicons goal "very crisp icons" so that no rounding of the paths and reduction of points is used.

This is just the svg, no other assets are generated (fonts, images).

Related, the Devicons used by Nerd Fonts have this fix applied (a fixed font can be downloaded there as well):

• https://github.com/ryanoasis/nerd-fonts/pull/1548

Zoom into the icon

Before and after