Update base entity to serialize odata type if it is provided

Author: Caitlin Bales (MSFT)

src/main/java/com/microsoft/graph/models/generated/BaseEntity.java

@@ -31,7 +31,7 @@
 public class BaseEntity implements IJsonBackedObject {
 
     @SerializedName("@odata.type")
-    @Expose(serialize = false)
+    @Expose
     public String oDataType;
 
     private transient AdditionalDataManager additionalDataManager = new AdditionalDataManager(this);