refactor: Use variables directly in formatted strings (#7284)

made with `cargo clippy --all --fix` then manually reviewed to ensure
this was the only thing that changed.

src/accounts.rs

@@ -78,7 +78,7 @@ impl Accounts {
         ensure!(dir.exists(), "directory does not exist");
 
         let config_file = dir.join(CONFIG_NAME);
-        ensure!(config_file.exists(), "{:?} does not exist", config_file);
+        ensure!(config_file.exists(), "{config_file:?} does not exist");
 
         let config = Config::from_file(config_file, writable).await?;
         let events = Events::new();
@@ -724,8 +724,7 @@ impl Config {
         {
             ensure!(
                 self.inner.accounts.iter().any(|e| e.id == id),
-                "invalid account id: {}",
-                id
+                "invalid account id: {id}"
             );
 
             self.inner.selected_account = id;