refactor(statusline): simplify and remove dead code

- Remove code that is never executed because the ruler is never rendered
  separately for a window with visible statusline or when `ls=3`, in
  other words: the variables `part_of_status` and `in_status_line` were
  always false for the ruler and badly named for the statusline itself.
- Leave `maxwidth` unchanged after calling `stl_alloc_click_defs`.
- Don't reuse the window's click definitions for the ruler. Even though
  it doesn't seem to be a bug because statusline and ruler are never
  shown at the same time for the same window, the ruler currently
  doesn't support clicks anyway.
- Disentangle the different cases, in particular statusline- from ruler-
  specific code. Another example: `wp->w_wincol`, `wp->w_winrow`, and
  `wp->w_width` are always used together, but this was hard to see.

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