contracts: make test work with debugger

frame/contracts/src/tests.rs

@@ -458,7 +458,12 @@ fn compile_module<T>(fixture_name: &str) -> wat::Result<(Vec<u8>, <T::Hashing as
 where
 	T: frame_system::Config,
 {
-	let fixture_path = ["fixtures/", fixture_name, ".wat"].concat();
+	let fixture_root = if std::env::var("CARGO_MANIFEST_DIR").is_ok() {
+		"fixtures/"
+	} else {
+		"frame/contracts/fixtures/"
+	};
+	let fixture_path = [fixture_root, fixture_name, ".wat"].concat();
 	let wasm_binary = wat::parse_file(fixture_path)?;
 	let code_hash = T::Hashing::hash(&wasm_binary);
 	Ok((wasm_binary, code_hash))