Issue #480 - Make edges round

Fixed to round edges in the following locations on home page and account page

1. components/ui/dialog.tsx : All dialogs edges are now rounded
2. components/DataExport : export button was made rounded
3. components/Witnesses/VotersDialog : pagination container was made rounded
4. components/account/AccountPagination : pagination on operations tab/account page was made rounded
5. components/account/tabs/AccountOperationViewTabs : Removed extra padding from the tabs inside the account page
6. components/account/tabs/comments/AccountCommentPermlinkResultTable : made edges of table rounded
7. components/account/tabs/comments/AccountCommentPermlinkSearchResults : Made pagination container rounded
8. components/account/tabs/interactions/InteractionsTabResult : Made pagination container rounded
9. components/home/searches/CommentPermlinkResultTable : Made pagination container rounded
10. components/home/searches/searchesResults/CommentPermlinkSearchResults : Made pagination container rounded
11. pages/block/[blockId].tsx : Made pagination container rounded