Remove relay.damus.io from default relay lists

Drops wss://relay.damus.io from the feedback relays, the Zapstore
update relays, and the backup inbox fallback relays.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01SbHwhreLtpQwvhqgALBANG

app/src/main/java/com/greenart7c3/nostrsigner/Amber.kt

@@ -649,7 +649,6 @@ class Amber :
     ): Boolean {
         val relays = setOfNotNull(
             RelayUrlNormalizer.normalizeOrNull("wss://nos.lol/"),
-            RelayUrlNormalizer.normalizeOrNull("wss://relay.damus.io/"),
         )
 
         val repositoryEvent = GitRepositoryEvent(

app/src/main/java/com/greenart7c3/nostrsigner/service/ApplicationBackup.kt

@@ -36,7 +36,6 @@ private const val PAYLOAD_VERSION = 1
 private val AGGREGATOR_RELAY = RelayUrlNormalizer.normalizeOrNull("wss://aggr.nostr.land/")
 private val INBOX_FALLBACK_RELAYS = listOfNotNull(
     RelayUrlNormalizer.normalizeOrNull("wss://nos.lol/"),
-    RelayUrlNormalizer.normalizeOrNull("wss://relay.damus.io/"),
 )
 
 data class BackupPermission(

app/src/main/java/com/greenart7c3/nostrsigner/service/ZapstoreUpdater.kt

@@ -40,7 +40,6 @@ private const val EOSE_TIMEOUT_MS = 15_000L
 private const val RELEASE_KIND = 30063
 private val UPDATE_RELAY_URLS = listOf(
     "wss://relay.zapstore.dev",
-    "wss://relay.damus.io",
     "wss://nos.lol",
 )
 private const val APP_IDENTIFIER = "com.greenart7c3.nostrsigner"