Use comma instead of colon for NWM time parts

[twhiteaker]

NWM server is older and requires a colon to separate values. It will be updated eventually and we'll have to use a comma instead.

E.g., we'll use
https://livefeeds2.arcgis.com/arcgis/rest/services/NFIE/NationalWaterModel_Medium/MapServer/0/query?where=egdb.dbo.LargeScale_v2.station_id%3D1620851&text=&objectIds=&time=0%2C11111111111111111111111&timeRelation=esriTimeRelationOverlaps&geometry=&geometryType=esriGeometryEnvelope&inSR=&spatialRel=esriSpatialRelIntersects&distance=&units=esriSRUnit_Foot&relationParam=&outFields=*&returnGeometry=false&returnTrueCurves=false&maxAllowableOffset=&geometryPrecision=&outSR=&havingClause=&returnIdsOnly=false&returnCountOnly=false&orderByFields=egdb.dbo.medium_term_current.timevalue+ASC&groupByFieldsForStatistics=&outStatistics=&returnZ=false&returnM=false&gdbVersion=&historicMoment=&returnDistinctValues=false&resultOffset=&resultRecordCount=80&returnExtentOnly=false&sqlFormat=none&datumTransformation=&parameterValues=&rangeValues=&quantizationParameters=&featureEncoding=esriDefault&f=html

Instead of
https://livefeeds2.arcgis.com/arcgis/rest/services/NFIE/NationalWaterModel_Medium/MapServer/0/query?where=egdb.dbo.LargeScale_v2.station_id%3D1620851&text=&objectIds=&time=0%3A11111111111111111111111&timeRelation=esriTimeRelationOverlaps&geometry=&geometryType=esriGeometryEnvelope&inSR=&spatialRel=esriSpatialRelIntersects&distance=&units=esriSRUnit_Foot&relationParam=&outFields=*&returnGeometry=false&returnTrueCurves=false&maxAllowableOffset=&geometryPrecision=&outSR=&havingClause=&returnIdsOnly=false&returnCountOnly=false&orderByFields=egdb.dbo.medium_term_current.timevalue+ASC&groupByFieldsForStatistics=&outStatistics=&returnZ=false&returnM=false&gdbVersion=&historicMoment=&returnDistinctValues=false&resultOffset=&resultRecordCount=80&returnExtentOnly=false&sqlFormat=none&datumTransformation=&parameterValues=&rangeValues=&quantizationParameters=&featureEncoding=esriDefault&f=html