ui(wallet): drop the "Your Wallets" header from the wallet list

It was redundant context — the screen title already says "Wallet" and
the cards underneath are clearly the user's. Removing the section
header reclaims vertical space on the main list. Kept the Spacer
above the first card so the cards don't bump against the OnchainSection
divider.

Leaving the wallet_your_wallets string resource in place so Crowdin
translations stay valid; removing it would force a fan-out across
every locale file for no functional gain.

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/wallet/WalletScreen.kt

@@ -235,11 +235,6 @@ private fun MultiWalletHomeContent(
     ) {
         item {
             Spacer(modifier = Modifier.height(8.dp))
-            Text(
-                text = stringRes(R.string.wallet_your_wallets),
-                style = MaterialTheme.typography.titleMedium,
-                fontWeight = FontWeight.SemiBold,
-            )
         }
 
         itemsIndexed(walletInfoList, key = { _, info -> info.walletId }) { index, walletInfo ->