Refresh main view when cycling pagers with main view focused

The previous logic only re-rendered the main view when the side panel itself was
focused. When the user pressed `0` to focus the main view, the
Normal/NormalSecondary context becomes Current and the equality check failed, so
cycling pagers had no visible effect. Mirror the pattern from postRefreshUpdate:
when the main view is focused, call HandleRenderToMain on the side panel below
it on the stack (which CurrentSide already returns).