BasicRenderer: Postings not properly aligned

[OliverEvans96]

Hello,

Thank you for this package! It's overall been great.

Just a minor bug I noticed: postings are aligned individually using tabs. If there is a significant difference in the length of the account names, the costs will not be aligned.

beancount/beancount-render/src/lib.rs

Lines 305 to 333 in 3ce2906

	for posting in &transaction.postings {
	self.render(posting, w)?;
	}
	render_key_value(self, w, &transaction.meta)
	}
	}
	impl<'a, W: Write> Renderer<&'a Posting<'_>, W> for BasicRenderer {
	type Error = BasicRendererError;
	fn render(&self, posting: &'a Posting<'_>, w: &mut W) -> Result<(), Self::Error> {
	write!(w, "\t")?;
	if let Some(flag) = &posting.flag {
	write!(w, "{} ", flag)?;
	}
	self.render(&posting.account, w)?;
	write!(w, "\t")?;
	self.render(&posting.units, w)?;
	if let Some(cost) = &posting.cost {
	write!(w, " ")?;
	self.render(cost, w)?;
	}
	if let Some(price) = &posting.price {
	write!(w, " @ ")?;
	self.render(price, w)?;
	}
	writeln!(w)?;
	render_key_value(self, w, &posting.meta)
	}
	}

An example output:

2023-09-06 * "Invoice #3 - ML GPU Benchmarks"
	Income:TomJohnson	2500.00 USD
	Assets:AccountsReceivable	2500.00 USD

Thanks,
Oliver