[integritee-service] fix clippy

Author: clangenb

service/src/config.rs

@@ -243,18 +243,15 @@ impl RunConfig {
 	}
 
 	pub fn shard(&self) -> Option<&str> {
-		self.shard.as_ref().map(|s| s.as_str())
+		self.shard.as_deref()
 	}
 
 	pub fn teeracle_update_interval(&self) -> Duration {
 		self.teeracle_update_interval.unwrap_or(DEFAULT_MARKET_DATA_UPDATE_INTERVAL)
 	}
 
 	pub fn marblerun_base_url(&self) -> &str {
-		self.marblerun_base_url
-			.as_ref()
-			.map(|s| s.as_str())
-			.unwrap_or("http://localhost:9944")
+		self.marblerun_base_url.as_deref().unwrap_or("http://localhost:9944")
 	}
 }