tx history improved layout

lib/store/dashboard/trade_filter_store.dart

@@ -69,6 +69,25 @@ abstract class TradeFilterStoreBase with Store {
   @observable
   bool displayNearIntents;
 
+  @computed
+  int get enabledProviders => [
+    displayXMRTO,
+    displayChangeNow,
+    displaySideShift,
+    displayMorphToken,
+    displaySimpleSwap,
+    displayTrocador,
+    displayExolix,
+    displayChainflip,
+    displayThorChain,
+    displayLetsExchange,
+    displayStealthEx,
+    displayXOSwap,
+    displaySwapTrade,
+    displaySwapXyz,
+    displayNearIntents
+  ].where((item) => item).length;
+
   @computed
   bool get displayAllTrades =>
       displayChangeNow &&