Incorrect parsing of inline object entries

[bioball]

This code:

foo { ["bar"] = 1 ["baz"] = 2 }

Is incorrectly parsed as subscript. Equivalent to:

foo { ["bar"] = 1["baz"] <ERROR unexpected '='> 2 }

[bioball]

Closing this; as of Pkl 0.28, the grammar requires a semicolon here so this parsing is actually correct.