Recursive: subsets: "cyrillic-ext" in METADATA.pb

**Describe the bug**
The [METADATA.pb](https://github.com/google/fonts/blob/main/ofl/recursive/METADATA.pb) include the following statement:
```
subsets: "cyrillic-ext"
subsets: "latin"
subsets: "latin-ext"
subsets: "menu"
subsets: "vietnamese"
```

`subsets: "cyrillic-ext"` is wrong. Recursive doesn't include any Cyrillic characters, even less of the Extended Cyrillic range.

**Expected behavior**
Please remove `subsets: "cyrillic-ext"`. This will not be missed by anyone, as the subset does not supply any characters, and it will avoid finding the typeface in a search for fonts that support the Extended Cyrillic range.