Psi Unifier: Do not unify parameters with block expressions

idea/testData/refactoring/extractFunction/stringTemplates/fullEntryWithSimpleName.kt.after

@@ -1,8 +1,8 @@
 // PARAM_DESCRIPTOR: value-parameter val a: kotlin.Int defined in foo
 // PARAM_TYPES: kotlin.Int, Number, Comparable<Int>, java.io.Serializable, Any
 fun foo(a: Int): String {
-    val x = "-$a"
-    val y = "x${a}y"
+    val x = "-${i(a)}"
+    val y = "x${i(a)}y"
     val z = "x$ay"
     return "abc${i(a)}def"
 }