[AViTi] Demux stats need to be multiple by 2

Independante lanes, are not so independante; Statistics take both lanes into account. So they need to be multiple by 2 in nf pipeline output.

See example demuxstat (from bases2fastq) below :

sbsuser@genobioinfo2:/work/project/PlaGe/test/dev_AVITI/data/20240924_AV241902_SideA_REPDEV_RUN1_1727881897$ cat IndexAssignment.csv
SampleNumber,SampleName,I1,I2,NumPoloniesAssigned,PercentPoloniesAssigned,Yield(Gb),Lane
3,Mais-F4P0-index3,GGACTTGG,CGCAGACG,368358131,51.402916,110.495007,1+2
2,bovin-37160-index1,CCGCGGTT,AGCGCTAG,329403523,45.966955,98.818253,1+2
1,PhiX,TGTGTCGA,TGTCTGAC,2586336,0.360913,0.775849,1+2
1,PhiX,GCACATAG,GACTACTA,2514257,0.350855,0.754226,1+2
1,PhiX,ATGTCGCT,CTAGCTCG,2345161,0.327258,0.703501,1+2
1,PhiX,CACAGATC,ACGAGAGT,2301567,0.321175,0.690423,1+2
2,bovin-37160-index1,CCGCGGTT,AGCGCTAG,329403523,45.966955,98.818253,1
1,PhiX,TGTGTCGA,TGTCTGAC,1370780,0.191287,0.411223,1
1,PhiX,GCACATAG,GACTACTA,1293179,0.180458,0.387944,1
1,PhiX,ATGTCGCT,CTAGCTCG,1227566,0.171302,0.368260,1
1,PhiX,CACAGATC,ACGAGAGT,1193784,0.166588,0.358126,1
3,Mais-F4P0-index3,GGACTTGG,CGCAGACG,368358131,51.402916,110.495007,2
1,PhiX,GCACATAG,GACTACTA,1221078,0.170397,0.366283,2
1,PhiX,TGTGTCGA,TGTCTGAC,1215556,0.169626,0.364626,2
1,PhiX,ATGTCGCT,CTAGCTCG,1117595,0.155956,0.335241,2
1,PhiX,CACAGATC,ACGAGAGT,1107783,0.154587,0.332297,2

Current nextflow output :

sbsuser@genobioinfo1:/work/project/PlaGe/test/dev_AVITI/data/20240924_AV241902_SideA_REPDEV_RUN1_1727881897/nextflow/Test-AVITI/bovin_Test-AVITI_20241009094540/Demux$ cat demultiplexStat.csv
Project,Sample,Barcode,bcCount,percOfFrag
REPDEV,bovin-37160-index1,CCGCGGTT-AGCGCTAG,329403523,45.966955
DefaultProject,PhiX,TGTGTCGA-TGTCTGAC,1370780,0.191287
DefaultProject,PhiX,GCACATAG-GACTACTA,1293179,0.180458
DefaultProject,PhiX,ATGTCGCT-CTAGCTCG,1227566,0.171302
DefaultProject,PhiX,CACAGATC-ACGAGAGT,1193784,0.166588
DefaultProject,Undetermined,CGCGGTTA-AGCGCTAG,979454,0.136679