Remove extra angle brackets in generate_head_metadata

[Sirius902]

generate_head_metadata_separated adds a set of angle brackets around the body tag as shown here

leptos/meta/src/lib.rs

Line 308 in 2d63436

(head, format!("<body{body_meta}>"))

That means generate_head_metadata introduces an extra set of angle brackets by interpolating that value like so <{body}>. This PR removes the extra set of angle brackets.

[gbj]

Whoops! Thanks.