Ops.Gl.Meshes.Cone cannot produce a mesh with 1 stack

[KOLEKTYW-online]

Cone op can't produce a cone with one stack. Minimum is 2, so by default it subdivides the cone sides.

I changed line 48 from:
if (nstacks < 2)nstacks = 2;

to:
if (nstacks < 1)nstacks = 1;

Works fine, produces a cone without a subdivision of the sides.

[pandrr]

done