orm: Option fk is zero-initialized instead of being set to none

[Le0Developer]

V doctor:

|V full version      |V 0.4.9 5b44b67.af1ef92
|:-------------------|:-------------------
|OS                  |macos, macOS, 15.2, 24C101
|Processor           |10 cpus, 64bit, little endian, Apple M4
|Memory              |0.68GB/16GB
|                    |
|V executable        |/Users/leodev/p/v/v/v
|V last modified time|2025-01-05 15:18:43
|                    |
|V home dir          |OK, value: /Users/leodev/p/v/v
|VMODULES            |OK, value: /Users/leodev/.vmodules
|VTMP                |OK, value: /tmp/v_501
|Current working dir |OK, value: /Users/leodev/p/v/fast2
|                    |
|Git version         |git version 2.47.0
|V git status        |weekly.2024.53-31-gaf1ef929 (1 commit(s) behind V master)
|.git/config present |true
|                    |
|cc version          |Apple clang version 16.0.0 (clang-1600.0.26.6)
|gcc version         |Apple clang version 16.0.0 (clang-1600.0.26.6)
|clang version       |Apple clang version 16.0.0 (clang-1600.0.26.6)
|tcc version         |tcc version 0.9.28rc 2024-02-05 HEAD@105d70f7 (AArch64 Darwin)
|tcc git status      |thirdparty-macos-arm64 713692d4
|emcc version        |N/A
|glibc version       |N/A

What did you do?
./v -g -o vdbg cmd/v && ./vdbg repro.v && repro

import db.sqlite

fn main() {
	db := sqlite.connect(':memory:')!

	sql db {
		create table Commit
		create table Measurement
	}!

	c := Commit { commit_hash: "hash" }
	sql db {
		insert c into Commit
	}!

	c2 := sql db {
		select from Commit
	}!
	println(c2)
	assert c2[0].v_self_default == none
}

@[table: 'commits']
struct Commit {
    commit_hash string @[primary]
    v_self_default         ?Measurement
}

@[table: 'measurements']
struct Measurement {
    id int @[primary; serial]
}

What did you see?

[Commit{
    commit_hash: 'hash'
    v_self_default: Option(Measurement{
        id: 0
    })
}]
repro.v:20: FAIL: fn main.main: assert c2[0].v_self_default == none
  left value: c2[0].v_self_default = Option(Measurement{
    id: 0
})
  right value: none = <none>
V panic: Assertion failed...
v hash: af1ef92
0   repro                               0x0000000102e95168 main__main + 4624
1   repro                               0x0000000102e955d4 main + 84
2   dyld                                0x000000019d4cc274 start + 2840

What did you expect to see?

Successful execution

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_{Huly®: V_0.6-21814}