Fix tests for windows build

src/test/java/at/pcgamingfreaks/mkvaudiosubtitlechanger/util/SetUtilsTest.java

@@ -1,20 +0,0 @@
-package at.pcgamingfreaks.mkvaudiosubtitlechanger.util;
-
-import org.junit.jupiter.api.Test;
-
-import java.util.List;
-import java.util.Set;
-
-import static org.junit.jupiter.api.Assertions.*;
-
-class SetUtilsTest {
-
-    @Test
-    void retainOf() {
-        List<Integer> list1 = List.of(1, 2, 3, 4, 5);
-        List<Integer> list2 = List.of(2, 4, 6, 8, 10);
-        Set<Integer> expected = Set.of(2, 4);
-
-        assertEquals(expected, SetUtils.retainOf(list1, list2));
-    }
-}