Fix SDLChoiceSet default timeout

[joeljfischer]

Bug Report

Currently, it's possible for SDLChoiceSet default timeouts to be used incorrectly.

Reproduction Steps

1. Create a SDLChoiceSet without the timeout set
2. Update the default timeout of SDLChoiceSet

Expected Behavior

The choice set created before the update uses the new default choice set time

Observed Behavior

The choice set uses the old default choice set time.

OS & Version Information

• iOS Version: n/a
• SDL iOS Version: 7.1.0-develop
• Testing Against: n/a

Test Case, Sample Code, and / or Example App

n/a

[NicoleYarroch]

Another issue I found was that if the timeout is set to 0, getting the timeout value should return the default timeout value. If the default value is 11, the timeout value should be 11; it actually returns 0.

[NicoleYarroch]

Fixed in #1912