Never restart cards farming module

There is enough logic to handle games added in the meantime already

Author: JustArchi

ArchiSteamFarm/Bot.cs

@@ -838,7 +838,11 @@ private string ResponseFarm(ulong steamID) {
 				return "This bot instance is not connected!";
 			}
 
-			CardsFarmer.RestartFarming().Forget();
+			if (CardsFarmer.CurrentGamesFarming.Count > 0) {
+				return "This bot instance is farming already!";
+			}
+
+			CardsFarmer.StartFarming().Forget();
 			return "Done!";
 		}
 
@@ -1662,7 +1666,8 @@ private async void OnGuestPassList(SteamApps.GuestPassListCallback callback) {
 			}
 
 			if (acceptedSomething) {
-				CardsFarmer.RestartFarming().Forget();
+				// Start farming, but only if we're not farming already
+				CardsFarmer.StartFarming().Forget();
 			}
 		}
 
@@ -2017,8 +2022,8 @@ private void OnPurchaseResponse(ArchiHandler.PurchaseResponseCallback callback)
 			}
 
 			if (callback.PurchaseResult == ArchiHandler.PurchaseResponseCallback.EPurchaseResult.OK) {
-				// We will restart CF module to recalculate current status and decide about new optimal approach
-				CardsFarmer.RestartFarming().Forget();
+				// Start farming, but only if we're not farming already
+				CardsFarmer.StartFarming().Forget();
 			}
 		}
 	}

ArchiSteamFarm/CardsFarmer.cs

@@ -187,11 +187,6 @@ internal async Task StopFarming() {
 			FarmingSemaphore.Release();
 		}
 
-		internal async Task RestartFarming() {
-			await StopFarming().ConfigureAwait(false);
-			await StartFarming().ConfigureAwait(false);
-		}
-
 		internal void OnNewItemsNotification() {
 			if (!NowFarming) {
 				return;