Fix build against libQuotient 0.8

src/login.cpp

@@ -43,7 +43,11 @@ void Login::init()
             return;
         }
 
+#ifdef QUOTIENT_07
+        m_isLoggedIn = Accounts.isLoggedIn(m_matrixId);
+#else
         m_isLoggedIn = AccountRegistry::instance().isLoggedIn(m_matrixId);
+#endif
         Q_EMIT isLoggedInChanged();
         if (m_isLoggedIn) {
             return;