Enable 'Paste' button only if the copied and selected target class are the same

[romanblanco]

Correction of #4513 (comment)

As @h-kataria mentioned, the buttons is supposed to be disabled, if the copied target class differs from the current target class.

This PR corrects the behaviour

Links

• Toolbar refactoring: Simple buttons without Rbac check #175 (comment)
• Automate Simulation copy to Button doesn't work #4189
• https://bugzilla.redhat.com/show_bug.cgi?id=1426390

[romanblanco]

@miq-bot add_label automation/automate, bug, fine/yes, gaprindashvili/yes

[miq-bot]

Checked commits romanblanco/manageiq-ui-classic@840e104~...15eaa01 with ruby 2.3.3, rubocop 0.52.1, haml-lint 0.20.0, and yamllint 1.10.0
2 files checked, 3 offenses detected

**

• 💣 💥 🔥 🚒 - Linter/Haml - Linter::Haml STDERR:

warning: parser/current is loading parser/ruby23, which recognizes
warning: 2.3.6-compliant syntax, but you are running 2.3.3.
warning: please see https://github.com/whitequark/parser#compatibility-with-ruby-mri.

spec/views/shared/buttons/_ab_form.html.haml_spec.rb

• ❗ - Line 10, Col 32 - Layout/MultilineArrayBraceLayout - Closing array brace must be on the line after the last array element when opening brace is on a separate line from the first array element.
• ❗ - Line 7, Col 7 - Layout/IndentArray - Use 2 spaces for indentation in an array, relative to the first position after the preceding left parenthesis.