wallet: Remove mainchain tip check on NeedsAccountsSync

This check could prevent a wallet from going through address discovery
if it had not completed the initial chain sync prior to being restarted.

One instance this could happen is when restoring SPV wallets under an
instable network connection or having a power loss during the initial
sync of a restored wallet.

wallet/wallet.go

@@ -5243,11 +5243,6 @@ func (w *Wallet) ChainParams() *chaincfg.Params {
 // should be performed to restore, per BIP0044, any generated accounts and
 // addresses from a restored seed.
 func (w *Wallet) NeedsAccountsSync(ctx context.Context) (bool, error) {
-	_, tipHeight := w.MainChainTip(ctx)
-	if tipHeight != 0 {
-		return false, nil
-	}
-
 	needsSync := true
 	err := walletdb.View(ctx, w.db, func(tx walletdb.ReadTx) error {
 		addrmgrNs := tx.ReadBucket(waddrmgrNamespaceKey)