clitools: Remove RUST_BACKTRACE from environment during tests

Signed-off-by: Daniel Silverstone <dsilvers@digital-scurf.org>

Author: kinnison

tests/mock/clitools.rs

@@ -69,6 +69,7 @@ pub fn setup(s: Scenario, f: &dyn Fn(&mut Config)) {
     env::remove_var("RUSTUP_TOOLCHAIN");
     env::remove_var("SHELL");
     env::remove_var("ZDOTDIR");
+    env::remove_var("RUST_BACKTRACE");
 
     let current_exe_path = env::current_exe().map(PathBuf::from).unwrap();
     let mut exe_dir = current_exe_path.parent().unwrap();