Fix mismatched support links for SwapTrade and Telegram (#3441)

Two entries in SupportViewModel's link list displayed one destination
but opened another.

SwapTrade pointed at mailto:support@exolix.com, so a user with a
SwapTrade trade problem emailed Exolix — who cannot help, and who
absorbed another provider's support traffic. The entry was added as
Quantex with Exolix's mailto already copy-pasted in from the entry
above it; the Quantex -> SwapTrade rename updated the title, icon and
linkTitle but carried the wrong link forward.

Point it at https://help.swaptrade.io/contact/, which matches what
docs.cakewallet.com/support/swap lists for SwapTrade. Live chat is the
only contact method that help center publishes — there is no SwapTrade
support email — so the mailto form is not an option. Using a path below
the displayed host follows the existing SideShift entry in this file.

Telegram had the inverse problem: linkTitle read t.me/cakewallet while
the link went to the announcements channel. Here the link was correct —
t.me/cakewallet is a group that self-describes as the inactive Cake
Wallet Community and directs visitors to the announcements channel — so
the stale label was updated to match the destination rather than the
reverse.

The other 15 entries were audited and are consistent.

lib/view_model/support_view_model.dart

@@ -44,7 +44,7 @@ abstract class SupportViewModelBase with Store {
           LinkListItem(
               title: 'Telegram',
               icon: 'assets/images/Telegram.png',
-              linkTitle: 't.me/cakewallet',
+              linkTitle: 't.me/cakewalletannouncements',
               link: 'https://t.me/cakewalletannouncements'),
           LinkListItem(
               title: 'Telegram Support Bot',
@@ -75,7 +75,7 @@ abstract class SupportViewModelBase with Store {
               title: 'SwapTrade',
               icon: 'assets/images/swap_trade.png',
               linkTitle: 'help.swaptrade.io',
-              link: 'mailto:support@exolix.com'),
+              link: 'https://help.swaptrade.io/contact/'),
           LinkListItem(
               title: 'Trocador',
               icon: 'assets/images/trocador.png',