Only do reverse-wrapping on cub1
Foot currently does reverse-wrapping (
bw) on everything that calls
term_cursor_left(). This is wrong; it should only be done for
auto_left_margin | bw | bw | cub1 wraps from column 0 to last column
See https://github.com/sbt/sbt/issues/6421 for an example where this is breaking things.
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