Refactor IRB color dispatch

The reason why we were checking lexer state in addition to token was
that we do not want to colorize local variable, method call, etc., while
they share the :on_ident token with a name of method definition which
should be colored as blue.

It means that we're concerned about the lexer state only for :on_ident.
Thus we can skip checking lexer state for non-:on_ident tokens. This
refactoring is based on that idea.

Also, now we manage Ripper's lexer state as Integer (use `|` if you
need to check multiple states). It should be faster than using Array of
Integer because #any? block call is not needed.

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