Veb context.set_header not working as expected for .content-type

[c-cesar]

Describe the bug

Setting the encoding with ctx.set_header(.content_type, 'text/html; charset=utf-8') results in only 'text/html' in the header.
Setting with ctx.content_type = 'text/html; charset=utf-8' works as expected.

Reproduction Steps

import veb
pub struct Context {
    veb.Context
}

pub struct App {
}

pub fn (app &App) page(mut ctx Context) veb.Result {
	ctx.set_header(.server, 'veb')
	ctx.set_header(.content_type, 'text/html; charset=utf-8')
	return ctx.text('Hello, World!')
}
fn main() {
	mut app := &App{}
	veb.run[App, Context](mut app,  8080)
}

Expected Behavior

Header
Content-Type: text/html; charset=utf-8

Current Behavior

Header
content-type: text/html

Possible Solution

No response

Additional Information/Context

No response

V version

0.4.10

Environment details (OS name and version, etc.)

Linux

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[huly-for-github]

Connected to Huly®: V_0.6-22409