unused parameter: correctly ignore parameters used in overridden methods

when graph was build over not project scope (IDEA-180281)

java/java-tests/testData/inspection/deadCode/parameterUsedInOutOfScopeOverrider/expected.xml

@@ -0,0 +1,2 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<problems/>

java/java-tests/testData/inspection/deadCode/parameterUsedInOutOfScopeOverrider/src/Test.java

@@ -0,0 +1,7 @@
+public class Test {
+  public void doSmth(String str) {}
+
+  public static void main(String[] args) {
+    new Test().doSmth("");
+  }
+}

java/java-tests/testData/inspection/deadCode/parameterUsedInOutOfScopeOverrider/test_src/Main.java

@@ -0,0 +1,5 @@
+public class Main extends Test {
+  public void doSmth(String str) {
+    System.out.println(str);
+  }
+}