invalid_paths: simplify invalid character detection

git-checks/src/invalid_paths.rs

@@ -52,7 +52,7 @@ impl InvalidPaths {
         chars.chars()
             .any(|ref c| {
                 !c.is_ascii() || self.disallowed_whitespace(*c) || c.is_control() ||
-                self.invalid_characters.chars().any(|ref ic| ic == c)
+                self.invalid_characters.contains(*c)
             })
     }