Weather widget: Change wording of 'Current fee'

[catch-21]

We should change the wording from 'Current fee' to avoid ambiguity. See https://www.figma.com/design/ltqvnKiejWj0JQiqtDf2JJ?node-id=27760-49915#1113300151

[aldertnl]

Indeed, it needs to be 'Current average fee' or 'Current median fee' (whatever value was chosen by the developers to utilize).

[catch-21]

verified in v109 (147)