decompiler: fixed inner class constructor signature decompilation

test/org/jetbrains/java/decompiler/SingleClassesTest.java

@@ -58,4 +58,5 @@ public class SingleClassesTest extends SingleClassesTestBase {
   @Test public void testAnonymousClass() { doTest("pkg/TestAnonymousClass"); }
   @Test public void testThrowException() { doTest("pkg/TestThrowException"); }
   @Test public void testInnerLocal() { doTest("pkg/TestInnerLocal"); }
+  @Test public void testInnerSignature() { doTest("pkg/TestInnerSignature"); }
 }