Fixed critical code supporting renamed controls.

Author: RussDev7

src/CoreKeeperInventoryEditor/MainForm.cs

@@ -467,7 +467,7 @@ private void MainForm_FormClosing(object sender, FormClosingEventArgs e)
                 // Save some form settings.
                 Settings.Default.ItemAmount = 50;
                 Settings.Default.ItemID = 110;
-                Settings.Default.CurrentItemTab = "TabPage1";
+                Settings.Default.CurrentItemTab = "Tab1_TabPage";
                 Settings.Default.ItemVariation = 0;
 
                 // Save UI form settings.
@@ -18360,4 +18360,4 @@ private void ComboBox2_SelectedIndexChanged(object sender, EventArgs e)
 
         #endregion // End admin tools.
     }
-}
+}