ENYO-592: Enable all to-be-enabled paging controls first.

### Issue
There can be instances where a paging control becomes disabled, and the corresponding and opposite paging control has not yet been enabled, causing Spotlight focus to move elsewhere.

### Fix
We ensure that the to-be-enabled paging controls are enabled first, so that Spotlight can still spot the opposite paging control when a paging control is disabled.

Enyo-DCO-1.1-Signed-off-by: Aaron Tam <aaron.tam@lge.com>