Don't mention FASTA in sequence modal's header.

As sequences are shown in GenBank format, while download option is FASTA.

Signed-off-by: Anurag Priyam <anurag08priyam@gmail.com>
Mention FASTA in download button in sequence modal.

Because download format is FASTA, while display is GenBank style.

Signed-off-by: Anurag Priyam <anurag08priyam@gmail.com>