LibJS: Correct behaviour of direct vs. indirect eval

eval only has direct access to the local scope when accessed through
the name eval. This includes locals named eval, because of course it
does.

Userland/Libraries/LibJS/Parser.h

@@ -37,7 +37,7 @@ class Parser {
 public:
     explicit Parser(Lexer lexer);
 
-    NonnullRefPtr<Program> parse_program();
+    NonnullRefPtr<Program> parse_program(bool starts_in_strict_mode = false);
 
     template<typename FunctionNodeType>
     NonnullRefPtr<FunctionNodeType> parse_function_node(u8 parse_options = FunctionNodeParseOptions::CheckForFunctionAndName);