Fix search ranker level (#1203)

Author: pamelafox

infra/main.bicep

@@ -217,7 +217,7 @@ module backend 'core/host/appservice.bicep' = {
       AZURE_STORAGE_CONTAINER: storageContainerName
       AZURE_SEARCH_INDEX: searchIndexName
       AZURE_SEARCH_SERVICE: searchService.outputs.name
-      AZURE_SEARCH_SEMANTIC_RANKER: searchServiceSemanticRankerLevel
+      AZURE_SEARCH_SEMANTIC_RANKER: actualSearchServiceSemanticRankerLevel
       AZURE_VISION_ENDPOINT: useGPT4V ? computerVision.outputs.endpoint : ''
       VISION_SECRET_NAME: useGPT4V ? computerVisionSecretName: ''
       SEARCH_SECRET_NAME: useSearchServiceKey ? searchServiceSecretName : ''