Fixed find usages for Java's invoke()

idea/testData/findUsages/java/findJavaMethodUsages/javaInvoke.0.java

@@ -0,0 +1,7 @@
+// PSI_ELEMENT: com.intellij.psi.PsiMethod
+// OPTIONS: usages
+
+public class JavaClass {
+    public void <caret>invoke() {
+    }
+}