Fix: Remove trailing comma

Because the old Rust version in the CI fails with this comma in the
macro call, we remove it here.

Signed-off-by: Matthias Beyer <[email protected]>

Author: matthiasbeyer

tests/env.rs

@@ -184,7 +184,7 @@ fn test_parse_bool() {
 
     assert!(matches!(
         config,
-        TestBoolEnum::Bool(TestBool { bool_val: true }),
+        TestBoolEnum::Bool(TestBool { bool_val: true })
     ));
 
     env::remove_var("BOOL_VAL");