Update Mendota Buoy meteorogram for 2020 season

Some channels were removed because they were old/redundant.

content/js/meteorogram/site_configs.js

@@ -337,7 +337,7 @@ var siteConfigs = {
                 traces: [
                     {
                         name: 'Chlorophyll',
-                        var_names: ['mendota.buoy.chlorophyll'],
+                        var_names: ['mendota.buoy.chlorophyll_ysi'],
                     },
                 ],
                 yaxis: {
@@ -354,7 +354,7 @@ var siteConfigs = {
                 traces: [
                     {
                         name: 'Phycocyanin',
-                        var_names: ['mendota.buoy.phycocyanin'],
+                        var_names: ['mendota.buoy.phycocyanin_ysi'],
                     },
                 ],
                 yaxis: {