Pass --style=plain by default when using bat

[andersk]

I was surprised when a lesspipe.sh upgrade caused less to start showing headers and line numbers like bat.

$ less README.md
───────┬────────────────────────────────────────────────────────────────────────
       │ File: README.md
───────┼────────────────────────────────────────────────────────────────────────
   1   │ # lesspipe.sh, a preprocessor for less
   2   │ 
   3   │ Version: 2.05
   4   │ Author : Wolfgang Friebel [wp.friebel@gmail.com](mailto://wp.friebel@gmail.com)
   5   │ License: GPL
   6   │ 
   7   │ Latest version available as:
   8   │  [zip file on github](https://github.com/wofr06/lesspipe.sh/archive/lesspipe.zip)
   9   │ and the [repository on github](https://github.com/wofr06/lesspipe)

This isn’t what I expect from less, and it breaks things like searching at the beginning of the line (/^License). If I wanted bat’s behavior I would have run bat (which automatically invokes a pager).

When we run bat, should we default to running it with --style=plain? I’m not the first person to want this: #83.

We should also run it with --paging=never since there’s never a reason to launch a second less. (As of sharkdp/bat#560, these two options can be combined and abbreviated to bat -pp.)