refactor: Change output file name of EFETCH

modules/efetch/main.nf

@@ -9,7 +9,7 @@ process EFETCH {
     publishDir "results", mode: 'copy'
 
     output:
-    path 'idv4.fasta'
+    path 'reference.fasta'
 
     script:
     """
@@ -18,6 +18,6 @@ process EFETCH {
             -query "${genome}" \\
         | efetch \\
             -format fasta \\
-        > idv4.fasta
+        > reference.fasta
     """
 }