simplify ViewportParams::setPlanetAxis()
simplify ViewportParams::setPlanetAxis()

within the if-clause:
* we know that the new centerLat is invalid -> no need to check again
* no need to normalize the invalid new centerLat, since it is assigned minLat/maxLat anyway
* moreover, "GeoDataPoint::normalizeLat( centerLat )" didn't have an effect anyway

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