Fix JS call

[aliabid94]

the _js parameter would not show updates to components in the cases where both:

• there was no accompanying backend python function
• all updated values were values only, and not gr.update JSONs

The reason for this is the line to cause svelte to re-render (root_node = root_node) was for some reason only in the code when gr.update were loaded, or there was an update to a status-tracker. All backend python functions make status-tracker updates, so if there's any python function then it always updates. Simply moving the re-render line to run after any update should fix this. Test with

import gradio as gr

with gr.Blocks() as demo:
    a = gr.Textbox()
    c = gr.Button()
    c.click(None, None, a, _js="() => {console.log('abc'); return ['abc'];}")

demo.launch()

Closes: #4485

[gradio-pr-bot]

All the demos for this PR have been deployed at https://huggingface.co/spaces/gradio-pr-deploys/pr-4486-all-demos

[pngwn]

I probably broke this.

[pngwn]

Code looks good. Can't test right now.

[freddyaboulton]

I was able to test and it works so if @pngwn says the code looks good then this can be merged once CI passes @aliabid94 !

[abidlabs]

I'll merge this in so that I can use it for #4456. Quick turnaround!