Added ObjectKeyword check to isPartOfTypeNode

The check for ObjectKeyword which seemed to be missing while checking for type of node was added to isPartOfTypeNode

Author: Prateek Nayak

src/compiler/utilities.ts

@@ -978,6 +978,7 @@ namespace ts {
             case SyntaxKind.StringKeyword:
             case SyntaxKind.BooleanKeyword:
             case SyntaxKind.SymbolKeyword:
+            case SyntaxKind.ObjectKeyword:
             case SyntaxKind.UndefinedKeyword:
             case SyntaxKind.NeverKeyword:
                 return true;