fix refresh issue with previous br with currency = current main currency

app/src/main/java/net/pokeranalytics/android/ui/fragment/SettingsFragment.kt

@@ -13,6 +13,7 @@ import io.realm.Realm
 import kotlinx.android.synthetic.main.fragment_settings.*
 import net.pokeranalytics.android.BuildConfig
 import net.pokeranalytics.android.R
+import net.pokeranalytics.android.model.realm.Currency
 import net.pokeranalytics.android.model.realm.Session
 import net.pokeranalytics.android.ui.activity.*
 import net.pokeranalytics.android.ui.activity.components.RequestCode
@@ -78,6 +79,10 @@ class SettingsFragment : PokerAnalyticsFragment(), RowRepresentableDelegate, Sta
 						Preferences.setCurrencyCode(data.getStringExtra(CurrenciesFragment.INTENT_CURRENCY_CODE), requireContext())
 						val realm = Realm.getDefaultInstance()
 						realm.executeTransaction {
+                            realm.where(Currency::class.java).isNull("code").or().equalTo("code", UserDefaults.currency.currencyCode).findAll().forEach { currency ->
+                                currency.rate = Currency.DEFAULT_RATE
+                            }
+
                             realm.where(Session::class.java).isNull("bankroll.currency.code").findAll().forEach { session ->
 								session.bankrollHasBeenUpdated()
 							}