message: refactor: simplify statement
  `map().unwrap_or()` replaced with an equivalent and shorter `map_or()`
diff: @@ -24,7 +24,7 @@ pub fn convert_gff_record_to_gene(gene_name: &str, record: &GffRecord) -> Result
  gene_name: gene_name.to_owned(),
  start,
  end: *record.end() as usize,
  - strand: record.strand().map(|s| s.into()).unwrap_or(GeneStrand::Unknown),
  + strand: record.strand().map_or(GeneStrand::Unknown, |s| s.into()),
  frame: parse_gff3_frame(record.frame(), start),
  })
  }
  