test: fix MavenLauncherTest (#2049)

Author: pvojtechovsky

src/test/java/spoon/MavenLauncherTest.java

@@ -21,7 +21,7 @@ public void spoonMavenLauncherTest() {
 
 		// with the tests
 		launcher = new MavenLauncher("./", MavenLauncher.SOURCE_TYPE.ALL_SOURCE);
-		assertEquals(19, launcher.getEnvironment().getSourceClasspath().length);
+		assertEquals(17, launcher.getEnvironment().getSourceClasspath().length);
 		// 236 because of the sub folders of src/main/java and src/test/java
 		assertTrue("size: "+launcher.getModelBuilder().getInputSources().size(), launcher.getModelBuilder().getInputSources().size() >= 220);