Fix traits and frequencies for reference builds

Reference builds for GISAID and open data didn't have traits or frequencies parameters specified. This fixes this issue to use more sensible parameters (region traits and frequencies back to 2020).

nextstrain_profiles/nextstrain-gisaid/builds.yaml

@@ -877,6 +877,9 @@ subsampling:
 # if different traits should be reconstructed for some builds, specify here
 # otherwise the default trait config in defaults/parameters.yaml will used
 traits:
+  reference:
+    sampling_bias_correction: 2.5
+    columns: ["region"]
   global_1m:
     sampling_bias_correction: 2.5
     columns: ["region"]
@@ -967,6 +970,10 @@ traits:
 # narrow_bandwidth = 0.019 or 7 days for "1m" and "2m"
 # narrow_bandwidth = 0.038 or 14 days for "6m" and "all-time"
 frequencies:
+  reference:
+    min_date: "2020-01-01"
+    narrow_bandwidth: 0.038
+    recent_days_to_censor: 7
   global_1m:
     min_date: "1M"
     narrow_bandwidth: 0.019

nextstrain_profiles/nextstrain-open/builds.yaml

@@ -882,6 +882,9 @@ refine:
 # if different traits should be reconstructed for some builds, specify here
 # otherwise the default trait config in defaults/parameters.yaml will used
 traits:
+  reference:
+    sampling_bias_correction: 2.5
+    columns: ["region"]
   global_1m:
     sampling_bias_correction: 2.5
     columns: ["region"]
@@ -972,6 +975,10 @@ traits:
 # narrow_bandwidth = 0.019 or 7 days for "1m" and "2m"
 # narrow_bandwidth = 0.038 or 14 days for "6m" and "all-time"
 frequencies:
+  reference:
+    min_date: "2020-01-01"
+    narrow_bandwidth: 0.038
+    recent_days_to_censor: 7  
   global_1m:
     min_date: "1M"
     narrow_bandwidth: 0.019