* lisp/simple.el (newline-and-indent): Disable `electric-indent-mode`

* lisp/simple.el (newline-and-indent): Disable `electric-indent-mode`

With `electric-indent-mode` enabled, `newline-and-indent` ends up indenting
3 times: once for the original line and twice on the new line.
`reindent-then-newline-and-indent` is even worse, indenting twice
both lines.
None of those commands should be affected by `electric-indent-mode`
since they even explicitly say in their name when and how they do
indentation.

(reindent-then-newline-and-indent): Temporarily disable
`electric-indent-mode` as well.