gh#179:Add dsVIDEO_FRAMERATE_59 and dsVIDEO_FRAMERATE_23 enums

[ljenchik]

• Added dsVIDEO_FRAMERATE_59 (position 15) to support integer 59Hz frame rate
• Added dsVIDEO_FRAMERATE_23 (position 16) to support integer 23Hz frame rate
• These enums enable accurate VTS validation for STB hardware that outputs integer frame rates instead of fractional NTSC rates (59.94Hz, 23.98Hz)
• Updated dsVIDEO_FRAMERATE_MAX to position 17

[github-actions]

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[ljenchik]

@CLAassistant check

[ljenchik]

recheck

[AnandPandav]

Approved.

[ljenchik]

recheck

[ljenchik]

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