refactor: small cleanup of some string formatting (#2130)

Some quick random refactors I spotted while looking at something else.

src/canvas/components/time_series/vendored.rs

@@ -990,13 +990,7 @@ mod tests {
                 (actual, expected) => {
                     if actual.area != expected.area {
                         panic!(
-                            indoc::indoc!(
-                                "
-                                buffer areas not equal
-                                expected:  {:?}
-                                actual:    {:?}"
-                            ),
-                            expected, actual
+                            "buffer areas not equal - expected: {expected:?} - actual: {actual:?}",
                         );
                     }
                     let diff = expected.diff(&actual);

src/options.rs

@@ -235,20 +235,19 @@ pub(crate) fn get_or_create_config(config_path: Option<&Path>) -> anyhow::Result
                 match create_config_at_path(path) {
                     Ok(cfg) => Ok(cfg),
                     Err(err) => {
+                        let path = path.display();
                         if config_path.is_some() {
                             Err(err.context(format!(
-                                "bottom could not create a new config file at '{}'.",
-                                path.display()
+                                "bottom could not create a new config file at '{path}'.",
                             )))
                         } else {
                             indoc::eprintdoc!(
-                                "Note: bottom couldn't create a default config file at '{}', and the \
+                                "Note: bottom couldn't create a default config file at '{path}', and the \
                                 application has fallen back to the default configuration.
 
                                 Caused by:
                                     {err}
                                 ",
-                                path.display()
                             );
 
                             Ok(Config::default())

src/options/args.rs

@@ -23,6 +23,7 @@ const TEMPLATE: &str = indoc! {
 
 const USAGE: &str = "btm [OPTIONS]";
 
+// Can't use an unwrap here at the moment since it's const.
 const VERSION: &str = match option_env!("NIGHTLY_VERSION") {
     Some(nightly_version) => nightly_version,
     None => crate_version!(),