fix: fixed create discount page

[maze-runnar]

Fixes #4050
reference : https://www.npmjs.com/package/ember-cli-clipboard/#actions

The following clipboard.js custom events are sent as actions

success sent on successful copy
error sent on failed copy

Checklist

• I have read the Contribution & Best practices Guide.
• My branch is up-to-date with the Upstream development branch.
• The acceptance, integration, unit tests and linter pass locally with my changes
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)

[maze-runnar]

[codecov]

Codecov Report

Merging #4051 into development will not change coverage.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           development   #4051   +/-   ##
===========================================
  Coverage         21.9%   21.9%           
===========================================
  Files              460     460           
  Lines             4735    4735           
===========================================
  Hits              1037    1037           
  Misses            3698    3698

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[kushthedude]

Next time please show the error log in the issue description too.