Fix failing tests

src/test/java/de/monticore/lang/monticar/generator/rosmsg/AbstractSymtabTest.java

@@ -96,7 +96,10 @@ public class AbstractSymtabTest {
             return false;
         }
         lines1 = discardEmptyLines(lines1);
+        lines1 = discardCopyrightNotice(lines1);
         lines2 = discardEmptyLines(lines2);
+        lines2 = discardCopyrightNotice(lines2);
+
         if (lines1.size() != lines2.size()) {
             Assert.fail(
                     "files have different number of lines: "
@@ -127,4 +130,10 @@ public class AbstractSymtabTest {
                 .filter(l -> !l.isEmpty())
                 .collect(Collectors.toList());
     }
+
+        private static List<String> discardCopyrightNotice(List<String> lines) {
+        return lines.stream()
+                .filter(l -> !l.contains("(c) https://github.com/MontiCore/monticore"))
+                .collect(Collectors.toList());
+    }
 }