js: template: Do not strip newlines
js: template: Do not strip newlines

Non-discriminatory newline stripping would wrongfully
collate pre-formatted (code) blocks.

The newline stripping/trimming was introduced as a
workaround because at the time, templates were written in
ES6 template literals (`${foo}`) and left a lot of newlines
in rendered HTML output, which lead to failures to convert
text to DOM elements using the `htmlify` helper.

These templates ended up being replaced by ES5 plain string
concatenation, which no longer requires the workaround.

Fixes https://github.com/posativ/isso/discussions/856

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