Use full Nextclade names for all gene segments

Not all gene segments define shorter aliases (e.g., "flu_h3n2_ha"), so
we need to use the full names (e.g., "nextstrain/flu/h3n2/ha") to
download each dataset.

profiles/nextclade/run-nextclade.smk

@@ -13,7 +13,7 @@ rule get_nextclade_dataset_for_lineage_and_segment:
     shell:
         """
         nextclade3 dataset get \
-            -n flu_{wildcards.lineage}_{wildcards.segment} \
+            -n 'nextstrain/flu/{wildcards.lineage}/{wildcards.segment}' \
             --output-dir {output.nextclade_dir}
         """