Change the way of runtime configuration in JsePsiUnifierTest

idea/testData/unifier/equivalence/expressions/callableReferences/classRefRuntime.kt

@@ -0,0 +1,12 @@
+class A {
+    inner class B
+
+    inner class C
+
+    fun foo() {
+        <selection>::B</selection>
+        ::C
+        A::B
+        A::C
+    }
+}