Add cloud fraction mapping for "Moderate Rain, Snow" (#71)

Updated cloud fraction mapping to include a specific mapping for the "Moderate
Rain, Snow" weather condition.

run/cloud_fraction_mapping.yaml

@@ -42,6 +42,7 @@ Moderate Rain Showers,Fog: [10.0]
 Moderate Rain Showers,Snow Showers,Fog: [10.0]
 Moderate Rain,Smoke: [10.0]
 Moderate Rain,Snow,Fog: [10.0]
+Moderate Rain,Snow: [10.0]
 Moderate Rain,Fog: [10.0]
 Moderate Snow: [10.0]
 Moderate Snow,Blowing Snow: [10.0]