Preserve `truncate-lines` to fix `visual-line-mode`

When one disables wrapping and uses `visual-line-mode`, things like
following an internal link ended up enabling `truncate-lines`. After
jumping back to the original position, rendering was done with
`truncate-lines` enabled, which breaks `visual-line-mode` until
`truncate-lines` was disabled again. Therefore, the value of the
variable is preserved whenever doing rendering to avoid this glitch.

Bonus: The responsible shr.el code does that in its table rendering
function and notes that it "probably won't work very well".

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