Fix formatting issue on Opt struct

tab in enable_metrics_route to fix cargo fmt issues

Resolves: #3469
See also: #2763

meilisearch/src/analytics/segment_analytics.rs

@@ -250,7 +250,7 @@ impl From<Opt> for Infos {
         // Thus we must not insert `..` at the end.
         let Opt {
             #[cfg(features = "metrics")]
-            enable_metrics_route: _,
+                enable_metrics_route: _,
             db_path,
             http_addr,
             master_key: _,