Converter:

Use formatter in converter tests
Reformat test data

j2k/tests/testData/ast/assignmentExpression/nullability.kt

@@ -1,8 +1,9 @@
 import java.util.BitSet
+
 open class Foo() {
-open fun foo(o : BitSet?) {
-var o2 : BitSet? = o
-var foo : Int = 0
-foo = o2?.size()!!
-}
+    open fun foo(o: BitSet?) {
+        var o2: BitSet? = o
+        var foo: Int = 0
+        foo = o2?.size()!!
+    }
 }