Do not newline when Signal::PossibleNewLine is at a column less than or equal to indent width about dprint

[dsherret]

I didn't feel right about fixing this in the core printer because I feel like that would cause some weird bugs.

Instead, this should be handled on a case-by-case basis using the following condition:

pub fn if_above_width(width: u8, items: PrintItems) -> Condition {
    Condition::new("ifAboveWidth", ConditionProperties {
        condition: Box::new(move |context| {
            let writer_info = &context.writer_info;
            let first_indent_col = writer_info.line_start_column_number + (width as u32);
            Some(writer_info.column_number > first_indent_col)
        }),
        true_path: Some(items),
        false_path: None
    })
}

Example use:

items.push_condition(if_above_width(
    context.config.indent_width,
    Signal::PossibleNewLine.into()
));