Fixes a 1.14 regression: the screensaver's time-per-item control adjusted only with the D-pad, leaving no way to change it on touchscreen Portals.
- The ◀ / ▶ arrows are now real tap targets (touch), while the remote keeps adjusting with left/right and moving focus away with up/down.
- The arrows are excluded from D-pad focus traversal, so the remote gets no extra stops.
Verified on the Portal TV with both the remote and simulated touch. Existing installs update in place.