Little exactness tweaks (#1874)

* Correct Windows paths

\\ is only for the beginning of UNC paths, e.g.
\\host-name\share-name\file-path
as per
https://docs.microsoft.com/en-us/windows/win32/fileio/naming-a-file

* Remove spaces path list using brace expansion

In the shell, spaces are significant in a path with brace expansion, and
break it. (As opposed to in Rust module brace expansion.)

src/cmd/serve.rs

@@ -419,7 +419,7 @@ pub fn serve(
         broadcaster
     };
 
-    println!("Listening for changes in {}{{{}}}", root_dir.display(), watchers.join(", "));
+    println!("Listening for changes in {}{{{}}}", root_dir.display(), watchers.join(","));
 
     println!("Press Ctrl+C to stop\n");
     // Delete the output folder on ctrl+C
@@ -764,9 +764,9 @@ mod tests {
     #[cfg(windows)]
     fn windows_path_handling() {
         let expected = (ChangeKind::Templates, PathBuf::from("/templates/hello.html"));
-        let pwd = Path::new(r#"C:\\Users\johan\site"#);
-        let path = Path::new(r#"C:\\Users\johan\site\templates\hello.html"#);
-        let config_filename = Path::new(r#"C:\\Users\johan\site\config.toml"#);
+        let pwd = Path::new(r#"C:\Users\johan\site"#);
+        let path = Path::new(r#"C:\Users\johan\site\templates\hello.html"#);
+        let config_filename = Path::new(r#"C:\Users\johan\site\config.toml"#);
         assert_eq!(expected, detect_change_kind(pwd, path, config_filename));
     }