diagnostic: fix cask env var output
With `each`, we don't actually output the processed values. We should therefore be using `filter_map` instead.
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@ -1068,7 +1068,7 @@ module Homebrew
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locale_variables = ENV.keys.grep(/^(?:LC_\S+|LANG|LANGUAGE)\Z/).sort
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cask_environment_variables = (locale_variables + environment_variables).sort.each do |var|
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cask_environment_variables = (locale_variables + environment_variables).sort.filter_map do |var|
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next unless ENV.key?(var)
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var = %Q(#{var}="#{ENV.fetch(var)}")
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