mobile: fix FilterLogs (#15418)

All logs in the FilterLog return value would be the same object 
because the for loop captured the pointer to the iteration variable.

mobile/ethclient.go

@@ -198,8 +198,8 @@ func (ec *EthereumClient) FilterLogs(ctx *Context, query *FilterQuery) (logs *Lo
 	}
 	// Temp hack due to vm.Logs being []*vm.Log
 	res := make([]*types.Log, len(rawLogs))
-	for i, log := range rawLogs {
-		res[i] = &log
+	for i := range rawLogs {
+		res[i] = &rawLogs[i]
 	}
 	return &Logs{res}, nil
 }