cgen: using non-ref app, while vweb expects ref

[MCausc78]

Describe the bug

title

Reproduction Steps

import x.vweb

pub struct App {
}

struct Context {
	vweb.Context
}

@['/']
fn (a App) index(mut ctx Context) vweb.Result {
	return ctx.text('hello world')
}

fn main() {
	mut app := App{}
	vweb.run[App, Context](mut app, 8080)
}

Expected Behavior

successful compile

Current Behavior

==================
C:/Users/mclr/AppData/Local/Temp/v_0/test.01HPM1V9B8F6H25RFJN06Y149K.tmp.c:33566: warning: assignment from incompatible pointer type
C:/Users/mclr/AppData/Local/Temp/v_0/test.01HPM1V9B8F6H25RFJN06Y149K.tmp.c:39345: error: cannot convert 'struct main__App *' to 'struct main__App'
...
==================
(Use `v -cg` to print the entire error message)

builder error:
==================
C error. This should never happen.

This is a compiler bug, please report it using `v bug file.v`.

https://github.com/vlang/v/issues/new/choose

You can also use #help on Discord: https://discord.gg/vlang

Possible Solution

No response

Additional Information/Context

No response

V version

V 0.4.4 ed5c2f3

Environment details (OS name and version, etc.)

V full version: V 0.4.4 57a33c3.ed5c2f3
OS: windows, Microsoft Windows 11 Pro v22000 64-bit
Processor: 12 cpus, 64bit, little endian, 

getwd: D:\Games\Proekti\JS-TS\disjs
vexe: D:\Games\Proekti\V\v\v.exe
vexe mtime: 2024-02-14 14:54:21

vroot: OK, value: D:\Games\Proekti\V\v
VMODULES: OK, value: C:\Users\mclr\.vmodules
VTMP: OK, value: C:\Users\mclr\AppData\Local\Temp\v_0

Git version: git version 2.37.0.windows.1
Git vroot status: weekly.2024.07-16-ged5c2f31
.git/config present: true

CC version:
thirdparty/tcc status: thirdparty-windows-amd64 a39eb79b

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