Fix warnings

Author: LegNeato

tests/difftests/tests/simple-compute/simple-compute-rust/src/main.rs

@@ -1,6 +1,5 @@
 use difftest::config::Config;
 use difftest::scaffold::compute::{RustComputeShader, WgpuComputeTest};
-use std::path::PathBuf;
 
 fn main() {
     // Load the config from the harness.

tests/difftests/tests/simple-compute/simple-compute-wgsl/src/main.rs

@@ -1,6 +1,5 @@
 use difftest::config::Config;
 use difftest::scaffold::compute::{WgpuComputeTest, WgslComputeShader};
-use std::path::PathBuf;
 
 fn main() {
     // Load the config from the harness.