str intp can't work with shared int in a struct

[kbkpbot]

Describe the bug

If a struct contains a field with shared int type, it can't be used in a string intp correctly.

May related to PR #25857

Reproduction Steps

shared.v

module main

struct Foo {
        baz shared int
}

fn main() {
        mut t := Foo{}
        rlock t.baz {
                k := '${t.baz}'
                dump(k)
        }
}

v run shared.v

Expected Behavior

[shared.v:11] k: 0

Current Behavior

$ v run shared.v
[shared.v:11] k: 7d9711c1efa0

a pointer value.

Possible Solution

No response

Additional Information/Context

No response

V version

V 0.4.12 967a4a2

Environment details (OS name and version, etc.)

V full version	V 0.4.12 967a4a2
OS	linux, Ubuntu 24.04.3 LTS
Processor	8 cpus, 64bit, little endian, Intel(R) Core(TM) i7-9700 CPU @ 3.00GHz
Memory	10.17GB/15.51GB
V executable	/media/HD/github/kbkpbot/v/v
V last modified time	2025-12-16 11:04:05
V home dir	OK, value: /media/HD/github/kbkpbot/v
VMODULES	OK, value: /home/mars/.vmodules
VTMP	OK, value: /tmp/v_1000
Current working dir	OK, value: /home/mars/v/bug/autostr
Git version	git version 2.43.0
V git status	weekly.2025.46-218-ga595c85d-dirty
.git/config present	true
cc version	cc (Ubuntu 13.3.0-6ubuntu2~24.04) 13.3.0
gcc version	gcc (Ubuntu 13.3.0-6ubuntu2~24.04) 13.3.0
clang version	Ubuntu clang version 18.1.3 (1ubuntu1)
tcc version	tcc version 0.9.28rc 2025-02-13 HEAD@f8bd136d (x86_64 Linux)
tcc git status	thirdparty-linux-amd64 696c1d84
emcc version	N/A
glibc version	ldd (Ubuntu GLIBC 2.39-0ubuntu8.6) 2.39

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