revise fastq output

tasks/fastqc.wdl

@@ -25,6 +25,6 @@ task fastqc {
     File read1_html="${read1name}_fastqc.html"
     File read1_zip="${read1name}_fastqc.zip"
     File read2_html="${read2name}_fastqc.html"
-    File read2_zip="${read1name}_fastqc.zip"
+    File read2_zip="${read2name}_fastqc.zip"
   }
 }