fix: use -Tembedded-test.x in std example build.rs

Signed-off-by: Kaspar Schleiser <[email protected]>

Author: kaspar030

examples/std/build.rs

@@ -2,7 +2,7 @@ use std::env;
 
 fn main() {
     // add linker script for embedded-test!!
-    println!("cargo::rustc-link-arg-tests=../../embedded-test.x");
+    println!("cargo::rustc-link-arg-tests=-Tembedded-test.x");
 
     // Check if the `defmt` feature is enabled, and if so link its linker script
     if env::var("CARGO_FEATURE_DEFMT").is_ok() {