applets/weather: Make desktop widget big enough to fit Configure button
requested to merge ngraham/kdeplasma-addons:make-desktop-widget-big-enough-to-hold-the-configure-button into master
If we don't set Layout.minimum{width,height} properties on the FullRepresentation, it will default to something tiny and the Configure… button shown on first launch will overflow.
Set it to a sane size, and also take into account the final layout once content later gets added so it isn't too small once configured.
BUG: 419591 FIXED-IN: 5.24.7
New minimum size on the desktop:
