fix(gui): widen origin selector widget and update silo submodule

- Increase OriginSelectorWidget max width from 120 to 160px for longer
  origin names
- Set explicit SizePolicy::Preferred for better toolbar layout
- Update silo submodule to fix/silo-workbench-bugs with auth and menu fixes

src/Gui/OriginSelectorWidget.cpp

@@ -54,8 +54,9 @@ void OriginSelectorWidget::setupUi()
 {
     setPopupMode(QToolButton::InstantPopup);
     setToolButtonStyle(Qt::ToolButtonTextBesideIcon);
-    setMinimumWidth(70);
-    setMaximumWidth(120);
+    setMinimumWidth(80);
+    setMaximumWidth(160);
+    setSizePolicy(QSizePolicy::Preferred, QSizePolicy::Fixed);
 
     // Create menu
     m_menu = new QMenu(this);