bug#32120: 26.1; In python.el tab-width should default to 4

[Carlos Pita]

>I think it doesn't
> make a lot of sense to default tab-width to 4.

Sorry, s/4/8/ here. 

python.el defaults tab-width to 8, but sets indent-tabs-mode to nil,

When you do rigid indentation, say C-x Tab and then S-Right, you get 8-spaces tab steps with that configuration.