LibWeb: Fix that non-member calls to window gave the wrong this_value

We treat all NativeFunctions as strict mode and thus window function
which were called in a global context (i.e. `setTimeout(f, 0)`) got a
null this_value. But we really need to treat all functions not defined
by the ECMAScript specification as non-strict. In most cases this won't
matter however since Window is also the global_object we have an extra
bit of logic.
To fix this more correctly we would need to track the strictness of
NativeFunctions.

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