applets/weather: Fix pressure representation on tooltip

Ismael Asensiorequested to merge
work/iasensio/weather-fix-pressure-tooltip into master

The pressure value shown in the tooltip was missing the unit conversion to the user's unit choice. The conversion also sets the right decimal precision of the display string.

BEFORE AFTER
Screenshot_20260112_102219 Screenshot_20260112_101925

BUG: 514419
FIXED-IN: 6.5.5

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