Plot changes when DEFAULTS are not rebuild.

[germa89]

I had to make the plotting defaults...

https://github.com/ansys/pymapdl/blob/600d9074b363fb811defcf47f51bc56da0148563/src/ansys/mapdl/core/plotting/plotting_defaults.py#L66-L82

to be reinstantiated every time they are called, in here:

https://github.com/ansys/pymapdl/pull/3519/commits/c80bca6b4b87d10bd17eef030d4c433fb41443cd

Because I was having random changes in the plots:

Basically, the glyphs were offset as well as the legend glyps.

Clearly there is something in our tests that change the glyphs configuration. I do not have the time now to investigate.

Pinging @AlejandroFernandezLuces for awareness.