fix(cxl-ui): fix cxl-featured-course-card slider width and paddings

[kertuilves]

Fix some style issues that came up during this development: https://github.com/conversionxl/cxl-wpstarter/pull/197

[github-actions]

size-limit report 📦

Path	Size
packages/cxl-ui/pkg/dist-web/cxl-ui.js	61.66 KB (+0.05% 🔺)
packages/cxl-ui/pkg/dist-web/cxl-ui-jwplayer.js	11.87 KB (0%)
packages/cxl-ui/pkg/dist-web/cxl-ui-playbooks.js	26.97 KB (+0.02% 🔺)
packages/cxl-ui/pkg/dist-web/vendor.js	135.58 KB (0%)
packages/cxl-ui/pkg/dist-web/cxl-ui-jwplayer.js, packages/cxl-ui/pkg/dist-web/cxl-ui-playbooks.js, packages/cxl-ui/pkg/dist-web/cxl-ui.js, packages/cxl-ui/pkg/dist-web/manifest.js, packages/cxl-ui/pkg/dist-web/unresolved.js, packages/cxl-ui/pkg/dist-web/vendor.js	237.22 KB (+0.02% 🔺)