ENYO-525 Use native character for Date & Time picker

Issue
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DatePicker and TimePicker shows western digit even though its locale is "fa-IR"

Cause
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`useNative: false` property in ilib.DateFmt prevent to use native character

Fix
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Remove `useNative: false`

Enyo-DCO-1.1-Signed-off-by: David Um david.um@lge.com