setRadius should invalidateSize of glassMap

[StefanBrand]

For the same reason we call invalidateSize() after magnifyingGlass has been added, we should call it after resizing the container. Tiles don't get loaded properly when you increase the radius (e.g. from 140 to 280).

Leaflet.MagnifyingGlass/leaflet.magnifyingglass.js

Lines 125 to 126 in 6112339

	// needed after the element has been added, otherwise tile loading is messy
	this._glassMap.invalidateSize();