[EUWE] Fixed code that sets values of button_image, display & open_url fields

[h-kataria]

https://bugzilla.redhat.com/show_bug.cgi?id=1401617

(cherry picked from commit e9c0b51)

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@chessbyte @simaishi @dclarizio please review, this is an EUWE PR for #13001

[miq-bot]

Checked commit h-kataria@914b6b5 with ruby 2.2.5, rubocop 0.37.2, and haml-lint 0.16.1
2 files checked, 1 offense detected

spec/controllers/application_controller/buttons_spec.rb

• ❕ - Line 115, Col 121 - Metrics/LineLength - Line is too long. [138/120]