Kotlin: Add test case for confusing overloading query

Author: tamasvajk

java/ql/test/kotlin/query-tests/ConfusingMethodSignature/ConfusingMethodSignature.expected renamed to java/ql/test/kotlin/query-tests/ConfusingOverloading/ConfusingOverloading.expected

@@ -12,3 +12,9 @@ class A {
     fun <T : Any> fn(value: T, i: Int = 1) {}
     fun fn(value: String, i: Int = 1) {}
 }
+
+class Foo {
+    val str by lazy {
+        "someString"
+    }
+}