GF-12659 : Slider Sampler Option bug fix

even "increment by 7" option is checked, slider still change 10. so, I
check status and seperate gap value and apply it.
Enyo-DCO-1.1-Signed-off-by: Changgi Lee <changgi.lee@lge.com>
Merge pull request #178 from sojujazz/GF-12659-sojujazz

GF-12659 : Slider Sampler Option bug fix

Reviewed-By: Ben Combee (ben.combee@lge.com)