gnu: dropseq-tools: Remove failing phase.

* gnu/packages/bioinformatics.scm (dropseq-tools)[arguments]: Delete
"generate-jar-indices" phase.

gnu/packages/bioinformatics.scm

@@ -12714,6 +12714,9 @@ contains
                   (guix build ant-build-system))
        #:phases
        (modify-phases %standard-phases
+         ;; FIXME: fails with "java.io.FileNotFoundException:
+         ;; /gnu/store/q76y0ximcziplgfpbn26kbw4h3s14f33-dropseq-tools-1.13/share/java/lib/biojava-alignment.jar"
+         (delete 'generate-jar-indices)
          ;; All dependencies must be linked to "lib", because that's where
          ;; they will be searched for when the Class-Path property of the
          ;; manifest is computed.