avoid overlapping of longitude labels in some cases (regression of commit f1b4db185111e9c23a7e7338176fee3171cf48de)
avoid overlapping of longitude labels in some cases (regression of commit f1b4db185111e9c23a7e7338176fee3171cf48de)

When the whole earth was visible, the lower longitude labels in Degree mode were overlapping.
This patch restores the old if clauses since the new ones (itStep != 0.0 || itStep != 180.0) always evaluate to true for any itStep.

tzapzoor/marble,utkuaydin/marble,tucnak/marble,rku/marble,adraghici/marble,David-Gil/marble-dev,Earthwings/marble,AndreiDuma/marble,David-Gil/marble-dev,adraghici/marble,AndreiDuma/marble,Earthwings/marble,quannt24/marble,tzapzoor/marble,AndreiDuma/marble,utkuaydin/marble,adraghici/marble,tucnak/marble,probonopd/marble,David-Gil/marble-dev,tucnak/marble,AndreiDuma/marble,adraghici/marble,AndreiDuma/marble,tzapzoor/marble,utkuaydin/marble,tucnak/marble,tzapzoor/marble,quannt24/marble,rku/marble,probonopd/marble,probonopd/marble,Earthwings/marble,rku/marble,adraghici/marble,adraghici/marble,rku/marble,tucnak/marble,Earthwings/marble,David-Gil/marble-dev,utkuaydin/marble,tzapzoor/marble,quannt24/marble,probonopd/marble,rku/marble,utkuaydin/marble,tzapzoor/marble,quannt24/marble,AndreiDuma/marble,quannt24/marble,utkuaydin/marble,tucnak/marble,quannt24/marble,probonopd/marble,tzapzoor/marble,tucnak/marble,David-Gil/marble-dev,David-Gil/marble-dev,probonopd/marble,probonopd/marble,quannt24/marble,Earthwings/marble,tzapzoor/marble,rku/marble,Earthwings/marble