When input has focus: move, don't redraw

[Felix E. Klee]

When the input field for entering a new hiscores entry has input focus and the screen resizes, then move hiscores elements, don't redraw them. Do that even if the list of hiscores changes.

Rationale:

• At least with some iOS versions, keyboard focus cannot be reassigned after a redraw.
• At least with some Firefox OS versions, the screen flickers when redrawing while the virtual keyboard slides in.
• It could be confusing if the input field goes away due to better hiscores being loaded from the server.

Redraw hiscores entries:

• when here is no input focus, or
• when changing to another board.