Compute indent never relative to current column

Previously the pretty printer would compute indentation always relative
to whatever column a block begins at, like this:

    fn demo(arg1: usize,
            arg2: usize);

This is never the thing to do in the dominant contemporary Rust style.
Rustfmt's default and the style used by the vast majority of Rust
codebases is block indentation:

    fn demo(
        arg1: usize,
        arg2: usize,
    );

where every indentation level is a multiple of 4 spaces and each level
is indented relative to the indentation of the previous line, not the
position that the block starts in.

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