radicle: Fix file limit setting for FreeBSD

On FreeBSD systems, the file limits are of type `i64` in comparison to
`u64` on Linux systems.

Also fix `rad web` command name on Windows and FreeBSD.

Co-authored-by: cloudhead <cloudhead@radicle.xyz>
Co-authored-by: Shawn Webb <shawn.webb@hardenedbsd.org>

radicle-httpd/src/commands/web.rs

@@ -192,6 +192,8 @@ pub fn run(options: Options, ctx: impl term::Context) -> anyhow::Result<()> {
     }
 
     if options.open {
+        #[cfg(any(target_os = "freebsd", target_os = "windows"))]
+        let cmd_name = "echo";
         #[cfg(target_os = "macos")]
         let cmd_name = "open";
         #[cfg(target_os = "linux")]