navigation: Unset the narrative text when the icon changes #2302
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Navigation narrative commonly comes only at specific intervals and at least OSMand does update the direction icon and countdown-distance way earlier.
This can lead to situations when the old narrative is displayed to a mismatched direction icon.
So after the icon changes, assume the narrative is not applicable anymore.
The flag-update in the code also happens before possibly updating the narrative, so if a new narrative text is send within the same update, this will happen just normally.