Fix :button selector evaluating :link_or_button expression filters #2131
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Fix for issue mentioned in https://groups.google.com/forum/#!topic/ruby-capybara/-RBMNqYvEuo .
When the link_or_button selector combines the link and button selectors expression_filters refers to the link_or_button selector which ends up creating incorrect attribute matchers. This fixes it by limiting to only expected attributes.