remove test.rs

that file is completely unused

sphinx-key/src/test.rs

@@ -1,9 +0,0 @@
-use esp_idf_svc::sys as _; // If using the `binstart` feature of `esp-idf-sys`, always keep this module imported
-
-fn main() {
-    // Temporary. Will disappear once ESP-IDF 4.4 is released, but for now it is necessary to call this function once,
-    // or else some patches to the runtime implemented by esp-idf-sys might not link properly.
-    esp_idf_svc::sys::link_patches();
-
-    println!("Hello, world!");
-}