settings: Fix app settings overriding issue. (#449)

This fixes an issue which was caused by saving the last active tab
before a functional tab activates. The bug was introduced in f409bb0449.
It was unnoticed from v1.5.0 to the latest v1.8.2.

The bug causes a serious issue where the app can't change the app settings and all settings were
getting overridden when a user switches back to setting page.

Fixes #448.

app/renderer/js/main.js

@@ -268,10 +268,10 @@ class ServerManagerView {
 	}
 
 	activateLastTab(index) {
-		// Open last active tab
-		ConfigUtil.setConfigItem('lastActiveTab', index);
-		// Open all the tabs in background
+		// Open all the tabs in background, also activate the tab based on the index
 		this.activateTab(index);
+		// Save last active tab
+		ConfigUtil.setConfigItem('lastActiveTab', index);
 	}
 
 	activateTab(index, hideOldTab = true) {