Revert "Reformat imports to a consistent style for imports"

This reverts commit 139d15cd84.

upload-perf/src/upload-perf.rs

@@ -1,13 +1,9 @@
-use {
-    serde_json::Value,
-    std::{
-        collections::HashMap,
-        env,
-        fs::File,
-        io::{BufRead, BufReader},
-        process::Command,
-    },
-};
+use serde_json::Value;
+use std::collections::HashMap;
+use std::env;
+use std::fs::File;
+use std::io::{BufRead, BufReader};
+use std::process::Command;
 
 fn get_last_metrics(metric: &str, db: &str, name: &str, branch: &str) -> Result<String, String> {
     let query = format!(