Removed duplicate call to LocalShortcuts.register
Removed duplicate call to LocalShortcuts.register

Per feedback https://github.com/brave/browser-laptop/commit/5a889ccd6198906537f0c29d4b28067292a4ef78#commitcomment-21323587

The version I changed (called above here) is kept in place because it's required for Windows.

I tested this change on macOS and Windows, works great on both :) (manually tested using ctrl + pgup/pgdown and cmd + left/right)

Auditors: da39a3ee5e6b4b0d3255bfef95601890afd80709@bridiver

diasdavid/browser-laptop,diasdavid/browser-laptop,timborden/browser-laptop,diasdavid/browser-laptop,diasdavid/browser-laptop,timborden/browser-laptop,timborden/browser-laptop,luixxiul/browser-laptop,luixxiul/browser-laptop,luixxiul/browser-laptop,timborden/browser-laptop,luixxiul/browser-laptop