main.nf: keep r2 id information

src/main.nf

@@ -17,7 +17,7 @@ Channel.fromPath( file(params.csv) )
                         fastq_r1 = file("${row.r1}")
                         fastq_r2 = file("${row.r2}")
                         r1: [['id': fastq_r1.simpleName, 'specie': row.specie, 'sex': row.sex, 'read': 'r1'], fastq_r1]
-                        r2: [['id': fastq_r1.simpleName, 'specie': row.specie, 'sex': row.sex, 'read': 'r2'], fastq_r2]
+                        r2: [['id': fastq_r2.simpleName, 'specie': row.specie, 'sex': row.sex, 'read': 'r2'], fastq_r2]
                     }
                     .set{ fastq }