Make compatible with Leaflet master
Make compatible with Leaflet master

The order of events during layer initialization was changed in
Leaflet/Leaflet@bd0bc4f2e56f3ccfe8d2817e2a213b0e1480ee26, resulting
in _onMiniMapMoving being called before _lastAimingRectPosition
has been initialized.
lokal-profil/Leaflet-MiniMap,emijrp/Leaflet-MiniMap,Norkart/Leaflet-MiniMap,emijrp/Leaflet-MiniMap,lokal-profil/Leaflet-MiniMap,chriswhong/leaflet-globeminimap,cmulders/Leaflet-MiniMap,cmulders/Leaflet-MiniMap,gavioto/Leaflet-MiniMap,chriswhong/leaflet-globeminimap,kuuup/Leaflet-MiniMap,kuuup/Leaflet-MiniMap,gavioto/Leaflet-MiniMap,Norkart/Leaflet-MiniMap