Fix ticket status display on VRSC mainnet

When viewing vlotto on VRSC mainnet, tickets sent to the graveyard
address were incorrectly showing as 'Sold' instead of 'Discarded'.

The network detection logic was treating null chain parameter (mainnet)
as VRSCTEST, causing it to use the wrong graveyard address for comparison.

Fixed by ensuring null/undefined chain correctly maps to VRSC network.

Author: vdappdev2

src/lib/services/vlottoService.ts

@@ -213,7 +213,7 @@ export async function enumerateAndFetchTickets(
 			const { ticketData, ticketIdentity } = result;
 
 			// Determine network type for graveyard address lookup
-			const network = (!chain || chain === 'vrsctest') ? 'VRSCTEST' : 'VRSC';
+			const network = (chain && chain.toLowerCase() === 'vrsctest') ? 'VRSCTEST' : 'VRSC';
 
 			// Check ticket status
 			const claimed = isTicketClaimed(ticketIdentity, claimedTicketsAddress);