Change Signature: Fix reference substitution when default value is a single simple name reference

#KT-10954 Fixed

idea/testData/refactoring/introduceParameter/simpleNameWithDefaultValueSubstitution.kt

@@ -0,0 +1,12 @@
+// WITH_DEFAULT_VALUE: false
+
+class A {
+    val prop = ""
+
+    fun foo() = bar("")
+
+    private fun bar(x: String): Boolean {
+        <selection>prop</selection>
+        return true
+    }
+}

idea/testData/refactoring/introduceParameter/simpleNameWithDefaultValueSubstitution.kt.after

@@ -0,0 +1,12 @@
+// WITH_DEFAULT_VALUE: false
+
+class A {
+    val prop = ""
+
+    fun foo() = bar("", prop)
+
+    private fun bar(x: String, s: String): Boolean {
+        s
+        return true
+    }
+}