Fix "Add Space" button text in disconnected state

When the account state was disconnected from an oCIS server, the button
would show "Add Folder" instead of "Add Space". This also fixes the
tooltip of the button.

Fixes: #11230

src/gui/accountsettings.cpp

@@ -828,9 +828,10 @@ void AccountSettings::slotAccountStateChanged()
         _toggleSignInOutAction->setText(tr("Log out"));
     }
 
-    ui->addButton->setEnabled(state == AccountState::Connected);
     if (state == AccountState::Connected) {
         ui->_folderList->setItemsExpandable(true);
+        ui->addButton->setEnabled(true);
+
         if (_accountState->supportsSpaces()) {
             ui->addButton->setText(tr("Add Space"));
             ui->addButton->setToolTip(tr("Click this button to add a Space."));
@@ -840,8 +841,15 @@ void AccountSettings::slotAccountStateChanged()
         }
     } else {
         ui->_folderList->setItemsExpandable(false);
-        ui->addButton->setText(tr("Add Folder"));
-        ui->addButton->setToolTip(tr("You need to be connected to add a folder."));
+        ui->addButton->setEnabled(false);
+
+        if (_accountState->supportsSpaces()) {
+            ui->addButton->setText(tr("Add Space"));
+            ui->addButton->setToolTip(tr("You need to be connected to add a Space."));
+        } else {
+            ui->addButton->setText(tr("Add Folder"));
+            ui->addButton->setToolTip(tr("You need to be connected to add a folder."));
+        }
 
         /* check if there are expanded root items, if so, close them */
         ui->_folderList->collapseAll();