Add missing field to support creating Evergreen campaigns

Author: JorgeMucientes

fluxc/src/main/java/org/wordpress/android/fluxc/model/blaze/BlazeCampaignCreationRequest.kt

@@ -19,7 +19,8 @@ data class BlazeCampaignCreationRequest(
     val urlParams: Map<String, String>,
     val mainImage: MediaModel,
     val targetingParameters: BlazeTargetingParameters?,
-    val timeZoneId: String = TimeZone.getDefault().id
+    val timeZoneId: String = TimeZone.getDefault().id,
+    val isEndlessCampaign: Boolean
 )
 
 data class BlazeCampaignCreationRequestBudget(

fluxc/src/main/java/org/wordpress/android/fluxc/network/rest/wpcom/blaze/BlazeCreationRestClient.kt

@@ -227,7 +227,8 @@ class BlazeCreationRestClient @Inject constructor(
                     "devices" to it.devices,
                     "page_topics" to it.topics
                 ).filterNotNull()
-            }
+            },
+            "is_evergreen" to request.isEndlessCampaign
         ).filterNotNull()
 
         val response = wpComNetwork.executePostGsonRequest(