Change NWDH from OAI harvest to OAI File harvest (#568)

There are persistent issues with the NWDH Combine OAI feed. Resolved by harvesting OAI feed to file via pyoai

src/main/scala/dpla/ingestion3/profiles/CHProviderProfiles.scala

@@ -294,7 +294,7 @@ class NcProfile extends XmlProfile {
 class NorthwestHeritageProfile extends XmlProfile {
   type Mapping = NorthwestHeritageMapping
 
-  override def getHarvester: Class[OaiHarvester] = classOf[OaiHarvester]
+  override def getHarvester: Class[OaiFileHarvester] = classOf[OaiFileHarvester]
   override def getMapping = new NorthwestHeritageMapping
 }