Improve template string replacements formatting

[postpostscript]

This is more of a pet peeve than anything, here's an example of how the val auto formatting can make the code a lot less clean: https://www.val.town/v/postpostscript/provideBlobExample?v=18

[tmcw]

We use dprint for autoformatting, and there's an upstream issue for this at dprint/dprint-plugin-typescript#349