Hotreloading doesn't hotreload let-bound rsx fragments

[jkelleyrtp]

Problem

The head_ block won't be hotreloaded:

use dioxus::prelude::*;

pub fn CoolChild() -> Element {
    let head_ = rsx! {
        div {
            div { "asasddasdasd" }
            div { "asasdd1asaassdd23asasddasdasd" }
        }
    };

    head_
}

Expected behavior

A clear and concise description of what you expected to happen.

Screenshots

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Environment:

• Dioxus version: [e.g. v0.17, master]
• Rust version: [e.g. 1.43.0, nightly]
• OS info: [e.g. MacOS]
• App platform: [e.g. web, desktop]

Questionnaire

• [ ] I'm interested in fixing this myself but don't know where to start
• [ ] I would like to fix and I have a solution
• [ ] I don't have time to fix this right now, but maybe later