Fix serf-referencing dependency parsing

Signed-off-by: Patrick Luca Fazzi <patrick91@live.it>

Author: pfazzi

src/rules/must_not_have_circular_dependencies.rs

@@ -251,6 +251,7 @@ pub fn unify_submodules_in_graph(
         let unified_deps: Vec<String> = deps
             .iter()
             .map(|d| unify_submodules(d, max_depth))
+            .filter(|d| d != &unified_node)
             .collect();
 
         new_graph

tests/test_architecture.rs

@@ -12,6 +12,9 @@ fn test_architectural_rules() {
 
     #[rustfmt::skip]
     let rules = ArchitecturalRules::define()
+        .rules_for_project()
+            .it_must_not_have_circular_dependencies(999)
+
         .rules_for_module("rust_arkitect::dsl")
             .it_may_depend_on(&[
                 "rust_arkitect::engine",