Fix search scope of Kotlin light methods

#KT-4638 Fixed

idea/testData/hierarchy/calls/callers/kotlinPrivateClass/KotlinPrivateClass_verification.xml

@@ -0,0 +1,3 @@
+<node text="Tester.Test  ()" base="true">
+  <node text="Tester.test()  ()"/>
+</node>

idea/testData/hierarchy/calls/callers/kotlinPrivateClass/main0.kt

@@ -0,0 +1,9 @@
+open class Tester {
+    open fun test() {
+        val test = Test()
+    }
+
+    private class <caret>Test {
+
+    }
+}

idea/testData/hierarchy/calls/callers/kotlinPrivateFunction/KotlinPrivateFunction_verification.xml

@@ -0,0 +1,3 @@
+<node text="Tester.privateTest()  ()" base="true">
+  <node text="Tester.test()  ()"/>
+</node>

idea/testData/hierarchy/calls/callers/kotlinPrivateFunction/main0.kt

@@ -0,0 +1,9 @@
+open class Tester {
+    open fun test() {
+        privateTest()
+    }
+
+    private fun <caret>privateTest() {
+        println(this)
+    }
+}

idea/testData/hierarchy/calls/callers/kotlinPrivateProperty/KotlinPrivateProperty_verification.xml

@@ -0,0 +1,3 @@
+<node text="Tester.privateTest  ()" base="true">
+  <node text="Tester.test()(2 usages)  ()"/>
+</node>

idea/testData/hierarchy/calls/callers/kotlinPrivateProperty/main0.kt

@@ -0,0 +1,10 @@
+open class Tester {
+    open fun test() {
+        privateTest = "test"
+        println(privateTest)
+    }
+
+    private var <caret>privateTest: String
+        get() = ""
+        set(value) { println(value) }
+}