verilog: formatting: tree_unwrapper.cc: Uncommented kPortList case

This removes a comment and a TODO from InterChildNodeHook, where
kPortList was commented out from triggering LookAheadBeyondCurrentNode,
what caused an attemped invalid formatting triggering a CHECK

fixes #1006

Signed-off-by: Jan Bylicki <jbylicki@antmicro.com>

verilog/formatting/tree_unwrapper.cc

diff --git a/verilog/formatting/tree_unwrapper.cc b/verilog/formatting/tree_unwrapper.cc
index c71f9a5..ef49b64 100644
--- a/verilog/formatting/tree_unwrapper.cc
+++ b/verilog/formatting/tree_unwrapper.cc
@@ -563,7 +563,7 @@
     case NodeEnum::kPortDeclarationList:
     case NodeEnum::kActualParameterByNameList:
     case NodeEnum::kPortActualList:
-    // case NodeEnum::kPortList:  // TODO(fangism): for task/function ports
+    case NodeEnum::kPortList:
     case NodeEnum::kModuleItemList:
     case NodeEnum::kGenerateItemList:
     case NodeEnum::kClassItems: