PlanToolBarIndicators: Fix mission time representation:
PlanToolBarIndicators: Fix mission time representation:

For missions of less than 1 hour this indicator was showing
1 hour plus the minutes of the mission. Also for missions
longer than 24 hours we had overflow here.

Hunter522/qgroundcontrol,Hunter522/qgroundcontrol,Hunter522/qgroundcontrol,Hunter522/qgroundcontrol,Hunter522/qgroundcontrol,Hunter522/qgroundcontrol