make servlet3 indy compatible

Author: SylvainJuge

instrumentation/servlet/servlet-3.0/javaagent/src/main/java/io/opentelemetry/javaagent/instrumentation/servlet/v3_0/Servlet3InstrumentationModule.java

@@ -33,12 +33,6 @@ public ElementMatcher.Junction<ClassLoader> classLoaderMatcher() {
     return hasClassesNamed("javax.servlet.ServletRegistration");
   }
 
-  @Override
-  public boolean isIndyModule() {
-    // GrailsTest fails
-    return false;
-  }
-
   @Override
   public List<TypeInstrumentation> typeInstrumentations() {
     return asList(