Added detection for design mode

I18N Commander/UI WinForms/Dialogs/InputDialog.cs

@@ -48,6 +48,9 @@ public partial class InputDialog : Form
 
     private void buttonOk_Click(object sender, EventArgs e)
     {
+        if(this.DesignMode)
+            return;
+        
         if (!string.IsNullOrWhiteSpace(this.textBoxInput.Text))
         {
             this.DialogResult = DialogResult.OK;