Distinguish between line and 2 windings transformer in TerminalFinder…

… default rules (#3117)

Signed-off-by: Franck LECUYER <franck.lecuyer@rte-france.com>

iidm/iidm-api/src/main/java/com/powsybl/iidm/network/util/TerminalFinder.java

@@ -86,7 +86,8 @@ private static List<Predicate<Terminal>> getDefaultRules() {
         List<Predicate<Terminal>> rules = new ArrayList<>();
         rules.add(t -> t.getConnectable() instanceof BusbarSection);
         rules.add(t -> t.getConnectable() instanceof Injection);
-        rules.add(t -> t.getConnectable() instanceof Branch);
+        rules.add(t -> t.getConnectable() instanceof Line);
+        rules.add(t -> t.getConnectable() instanceof TwoWindingsTransformer);
         rules.add(t -> t.getConnectable() instanceof ThreeWindingsTransformer);
         rules.add(t -> t.getConnectable() instanceof HvdcConverterStation);
         rules.add(Objects::nonNull);