Java to Kotlin converter: replacing equals call to ==/!= and no redundant parethesis generation

#KT-4426 Fixed

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

@@ -3,9 +3,9 @@ class C() {
     }
 
     fun bar(b: Boolean) {
-        foo((if (b)
+        foo(if (b)
             "a"
         else
-            null))
+            null)
     }
 }