Set state-based clock rate based on literature search

From May et al, 2011 "Phylogeography of West Nile Virus: From the Cradle of Evolution in Africa to Eurasia, Australia, and the Americas"
https://journals.asm.org/doi/10.1128/jvi.01963-10

Table 1, IS98-STD and North America 6.53E-04

phylogenetic/build-configs/washington-state/config.yaml

@@ -20,7 +20,7 @@ subsampling:
   force_include: --exclude-all --include ../nextclade/defaults/include.txt
 
 refine:
-  treetime_params: --coalescent opt --clock-filter-iqd 4 --date-inference marginal --date-confidence
+  treetime_params: --coalescent opt --clock-filter-iqd 4 --date-inference marginal --date-confidence --clock-rate 0.000653
 
 traits:
   metadata_columns: [