FossID: Scanner option `fetchSnippetMatchedLines` should be removed

[nnobelis]

Due to changes in ORT (https://github.com/oss-review-toolkit/ort/pull/7401), the snippets results are now grouped by source line ranges. Therefore, missing the matched lines information does not make sense if one wants to work with snippets.

I suggest we remove this option and always assume it's true. This call is expensive though since one such request is made per snippet, but hopefully it will be better when FossID change it's API to an OPENAPI-compliant one.