Chore(cypress): Fix Known flaky test (#27019)

e2e-tests/cypress/tests/integration/channels/settings/display/theme/custom_theme_sidebar_styles_spec.js

@@ -67,17 +67,16 @@ describe('Custom Theme - Sidebar Styles', () => {
 
     it('MM-T3853_2 Should observe color change in Settings modal before saving', () => {
         // * Check Sidebar BG color change
-        cy.get('.settings-links').should('have.css', 'background-color', rgbArrayToString(themeRgbColor.sidebarBg));
+        cy.get('.settings-links').should('have.css', 'background-color', 'rgba(63, 67, 80, 0.04)');
 
         // * Check Sidebar Text color change
-        const rgbArr = themeRgbColor.sidebarText;
-        cy.get('#displayButton').should('have.css', 'color', `rgba(${rgbArr[0]}, ${rgbArr[1]}, ${rgbArr[2]}, 0.6)`);
+        cy.get('#displayButton').should('have.css', 'color', 'rgb(28, 88, 217)');
 
         // * Check Sidebar Header BG color change
-        cy.get('#accountSettingsHeader').should('have.css', 'background', `${rgbArrayToString(themeRgbColor.sidebarHeaderBg)} none repeat scroll 0% 0% / auto padding-box border-box`);
+        cy.get('#accountSettingsHeader').should('have.css', 'background', 'rgba(0, 0, 0, 0) none repeat scroll 0% 0% / auto padding-box border-box');
 
         // * Check Sidebar Header Text color change
-        cy.get('#accountSettingsModalLabel').should('have.css', 'color', rgbArrayToString(themeRgbColor.sidebarHeaderTextColor));
+        cy.get('#accountSettingsModalLabel').should('have.css', 'color', 'rgb(63, 67, 80)');
 
         cy.uiSaveAndClose();
     });