Plan: map jumps to 0,0 when pressing Home Location

#### Issue details
On the planning tab if you press Home Location, the map jumps to coordinates 0,0 instead of the newly set home location.
(Vehicle of course has to be connected to MP with GPS lock.)

#### Version
The issue appeared with version 1.3.71
Currently using APM:Copter 4.0.3

#### Platform
[X] All
[ ] AntennaTracker
[ ] Copter
[ ] Plane
[ ] Rover
[ ] Sub

#### Airframe type
Not relevant

#### Hardware type
Windows 10 laptop

#### Logs
Not relevant

Start by reproducing the issue from the Planning tab with a connected vehicle that has GPS lock, then trace the Home Location action and the map coordinate update. Done means the map centers on the newly set home location rather than coordinates 0,0.

Written by the indexing model from the issue text.