webOS: allow user to decide about the screensaver

[cscd98]

Guidelines

1. Rebase before opening a pull request
2. If you are sending several unrelated fixes or features, use a branch and a separate pull request for each
3. If possible try squashing everything in a single commit. This is particularly beneficial in the case of feature merges since it allows easy bisecting when a problem arises

Description

This just wires up the front end suppress screensaver setting so users can chose whether or not the screensaver can interrupt gameplay when left idle.

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