Don't ask for PK again when chaging back to a editing-enabled view

When unlocking a view for editing by specifying a pseudo-PK, then
switching to another table, and then coming back to the original view,
you would be asked again for the pseudo-PK even though it was stored.
The same applies when loading a project file for this case. This is
fixed by this commit.

src/MainWindow.cpp

@@ -2828,7 +2828,9 @@ void MainWindow::unlockViewEditing(bool unlock, QString pk)
     m_browseTableModel->setPseudoPk(pk);
 
     // Update checked status of the popup menu action
+    ui->actionUnlockViewEditing->blockSignals(true);
     ui->actionUnlockViewEditing->setChecked(unlock);
+    ui->actionUnlockViewEditing->blockSignals(false);
 
     // Save settings for this table
     browseTableSettings[currentTable].unlockViewPk = pk;