New J2K: Fix existing test data

j2k/testData/fileOrElement/assignmentExpression/nullability-settings.new.kt

@@ -2,9 +2,9 @@
 // !specifyLocalVariableTypeByDefault: true
 
 internal class Foo {
-    fun foo(o: HashSet<*>?) {
-        val o2: HashSet<*>? = o
+    fun foo(o: HashSet<*>) {
+        val o2: HashSet<*> = o
         var foo: Int = 0
-        foo = o2!!.size
+        foo = o2.size
     }
 }

j2k/testData/fileOrElement/assignmentExpression/nullability.new.kt

@@ -1,6 +0,0 @@
-internal class Foo {
-    fun foo(o: HashSet<*>?) {
-        var foo = 0
-        foo = o!!.size
-    }
-}