fix RAM size for Home BASIC (`11506 Bytes free`)

Real Home BASIC should show `11506 Bytes free` when started on SC-3000.

Version tested on real hardware:
```
32K Home BASIC (JP).sc crc32:78a37cbc md5:cb724ebeaec9619281a906671c98a952 sha1:f1e1e7e9687cf4f9f498779a44134c2d70bb8d4b sha256:39958a177aa16af14dd34f665ccec086516f2adda75bc427a52773a68c74ab1f size:32768
```

<img width="532" height="393" alt="Image" src="https://github.com/user-attachments/assets/8fdf06c3-d6b8-4581-a7e9-6af8e5535b0f" />
<img width="985" height="249" alt="Image" src="https://github.com/user-attachments/assets/b10c83d6-e23a-493f-af67-9ee04a5114bd" />
<img width="491" height="631" alt="Image" src="https://github.com/user-attachments/assets/31f9a8be-e638-4a5d-8190-a21770ae68bf" />

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fix RAM size for Home BASIC (`11506 Bytes free`) #135

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fix RAM size for Home BASIC (11506 Bytes free) #135

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fix RAM size for Home BASIC (`11506 Bytes free`) #135