chore: move enable_multi_variant_queries to the correct config section (#18161)

cmd/loki/loki-local-config.yaml

@@ -27,6 +27,7 @@ query_range:
 
 limits_config:
   metric_aggregation_enabled: true
+  enable_multi_variant_queries: true
 
 schema_config:
   configs:
@@ -49,10 +50,6 @@ ruler:
 frontend:
   encoding: protobuf
 
-querier:
-  engine:
-    enable_multi_variant_queries: true
-
 
 # By default, Loki will send anonymous, but uniquely-identifiable usage and configuration
 # analytics to Grafana Labs. These statistics are sent to https://stats.grafana.org/