frontend/account-summary: fix regression during address scanning

Recent commit d8c6ba0 refactored the account summary section to group
accounts by keystore. The commit also introduced a small regression, hiding
the account rendering until the balance of each account is ready, while the
previous behavior was to show the accounts displaying the scanned addresses.

This fixes the regression.

Author: Beerosagos

frontends/web/src/routes/account/summary/accountssummary.tsx

@@ -189,15 +189,15 @@ export function AccountsSummary({
                   <AddBuyReceiveOnEmptyBalances accounts={accounts} balances={balances} />
                 ) : undefined
               } />
-            {accountsByKeystore && balancePerCoin &&
+            {accountsByKeystore &&
               (accountsByKeystore.map(({ keystore, accounts }) =>
                 <SummaryBalance
                   keystoreDisambiguatorName={isAmbiguiousName(keystore.name, accountsByKeystore) ? keystore.rootFingerprint : undefined}
                   connected={keystore.connected}
                   keystoreName={keystore.name}
                   key={keystore.rootFingerprint}
                   accounts={accounts}
-                  totalBalancePerCoin={balancePerCoin[keystore.rootFingerprint]}
+                  totalBalancePerCoin={ balancePerCoin ? balancePerCoin[keystore.rootFingerprint] : undefined}
                   totalBalance={ accountsTotalBalance ? accountsTotalBalance[keystore.rootFingerprint] : undefined}
                   balances={balances}
                 />