Change confirm dialog styles

[renatho]

Changes proposed in this Pull Request

• It changes the confirm dialog styles.

Testing instructions

• See 1670-gh-Automattic/sensei-pro

[codecov]

Codecov Report

Merging #5454 (16a2937) into trunk (5ff52a7) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##              trunk    #5454   +/-   ##
=========================================
  Coverage     44.54%   44.54%           
  Complexity     8749     8749           
=========================================
  Files           412      412           
  Lines         31166    31166           
  Branches        234      234           
=========================================
  Hits          13882    13882           
  Misses        17111    17111           
  Partials        173      173           

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[fjorgemota]

🚀

Looks good and works well!