gnu: pigx-scrnaseq: Use latest version of Pandoc.

* gnu/packages/bioinformatics.scm (pigx-scrnaseq)[inputs]: Replace
"ghc-pandoc-citeproc-with-pandoc-1" with "ghc-pandoc-citeproc", and
"ghc-pandoc-1" with "ghc-pandoc".

gnu/packages/bioinformatics.scm

@@ -13005,8 +13005,8 @@ (define-public pigx-scrnaseq
        ("python-magic" ,python-magic)
        ("python-numpy" ,python-numpy)
        ("python-loompy" ,python-loompy)
-       ("ghc-pandoc" ,ghc-pandoc-1)
-       ("ghc-pandoc-citeproc" ,ghc-pandoc-citeproc-with-pandoc-1)
+       ("ghc-pandoc" ,ghc-pandoc)
+       ("ghc-pandoc-citeproc" ,ghc-pandoc-citeproc)
        ("samtools" ,samtools)
        ("snakemake" ,snakemake-4)
        ("star" ,star)