Add FZJ to input4MIPs_institution_id.json

[durack1]

FZJ appears to be the only obvious omission from the input4MIPs_institution_id.json

input4MIPs_CVs/CVs/input4MIPs_institution_id.json

Lines 2 to 27 in c841be3

	"CCCma",
	"CNRM-Cerfacs",
	"CR",
	"DRES",
	"IACETH",
	"IAMC",
	"ImperialCollege",
	"MOHC",
	"MPI-B",
	"MPI-M",
	"MRI",
	"NASA-GSFC",
	"NCAR",
	"NCAS",
	"PCMDI",
	"PIK",
	"PNNL-JGCRI",
	"SOLARIS-HEPPA",
	"UCLA",
	"UCI",
	"UColorado",
	"UReading",
	"UoM",
	"UofMD",
	"VUA",
	"uoexeter"

It seems quite a number of the CMIP6 contributors are also listed.

We will need to figure out how to homogenize information across the WCRP-universe, e.g., WCRP-CMIP/WCRP-universe#65