fixing save state on change

readSettings changed CurrentTab and Visible by calling saveSettings

some slot connections were wrong


## saveSettings signals triggered by readSettings

PropertiesWidget::readSettings trigger the signals filesList->header() sortIndicatorChanged, tabChanged and visibilityToggled that call PropertiesWidget::saveSettings

the ideal code logic of readSettings not calling saveSettings when applying settings is unachievable bc the sortIndicatorChanged signal can't be avoided bc it's in qt code in restoreState

the best solution is therefore to read all settings before applying them (that call saveSettings)