applets/weather: Fix apperance and size for the umbrella emoji

Ismael Asensiorequested to merge
work/iasensio/weather-umbrella into master

If the regular font and the emoji font don't match, the height of the bounding boxes will be different for labels with or without the umbrella, disrupting the layout.

Let's set a fixed height using the metrics of the regular font, and also remove the unicode marker for text-mode emojis, because it's non-deterministic, not getting translated, and also looks worse.

BEFORE AFTER (hopefully)
weather-umbrella-bad weather_12h_day_after

BUG: 492340
FIXED-IN: 6.2

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