lrcinstance: avoid to call getAccountList continuously

Change-Id: Ia8ecf2aa61c3e1725949ec1e2e4cb9aae33c0982
Gitlab: #46

src/lrcinstance.h

@@ -259,8 +259,9 @@ public:
     static const QString &
     getCurrAccId()
     {
+        if (instance().selectedAccountId_.isEmpty()) {
             auto accountList = accountModel().getAccountList();
-        if (instance().selectedAccountId_.isEmpty() && accountList.size()) {
+            if (accountList.size())
                 instance().selectedAccountId_ = accountList.at(0);
         }
         return instance().selectedAccountId_;