fix: raise SandboxError exception if unsupported platform

Author: qkaiser

src/sandbox/unsupported.rs

@@ -1,9 +1,5 @@
-use log;
-
 use crate::sandbox::AccessFS;
 
 pub fn restrict_access(_access_rules: &[AccessFS]) -> Result<(), Box<dyn std::error::Error>> {
-    log::warn!("Sandboxing FS access is unavailable on this system");
-
-    Ok(())
+    Err("Sandboxing FS access is unavailable on this system")?
 }