Fixed KT-2019 Unit test runner: navigation by double click from a test to source code does not work

#KT-2019 fixed

compiler/jet.as.java.psi/src/org/jetbrains/jet/asJava/ClsWrapperStubPsiFactory.java

@@ -102,6 +102,11 @@ class ClsWrapperStubPsiFactory extends StubPsiFactory {
         if (origin == null) return delegate.createMethod(stub);
 
         return new ClsMethodImpl(stub) {
+            @Override
+            public PsiElement getMirror() {
+                return origin;
+            }
+
             @NotNull
             @Override
             public PsiElement getNavigationElement() {