decklink: Update enum value bounds check in gst_decklink_get_mode()
The widescreen modes moved after GST_DECKLINK_MODE_2160p60 and using them now would cause an assertion. This is a regression from 309f6187.
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The widescreen modes moved after GST_DECKLINK_MODE_2160p60 and using them now would cause an assertion. This is a regression from 309f6187.