Fix clippy warnings

Author: SpartanPlume

crates/libs/config/src/lib.rs

@@ -24,7 +24,7 @@ fn get_environment_filename() -> Result<String, ConfigError> {
     let environment: Environment = std::env::var("APP_ENVIRONMENT")
         .unwrap_or_else(|_| "local".into())
         .try_into()
-        .map_err(|e| ConfigError::InvalidEnvironment(e))?;
+        .map_err(ConfigError::InvalidEnvironment)?;
     let environment_filename = format!("{}.yml", environment.as_str());
     Ok(environment_filename)
 }

crates/services/api/src/routes/tournaments.rs

@@ -27,10 +27,7 @@ pub async fn get_tournaments(
         let per_page = pagination.per_page.unwrap();
         query_builder = query_builder.limit(per_page);
         if pagination.page.is_some() {
-            let mut page = pagination.page.unwrap();
-            if page > 0 {
-                page -= 1;
-            }
+            let page = pagination.page.unwrap().saturating_sub(1);
             query_builder = query_builder.offset(page * per_page);
         }
     }