applets/weather: Visual improvements for the top panel

Ismael Asensiorequested to merge
work/iasensio/weather-visual-top into master

Make the items for the current status (wind and temperature) more prominent in the applet, that is, bigger and more centered.

The temperature specially is the main piece of information one is usually looking after

BEFORE AFTER
weather-top-before weather-top-after

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