applets/batterymonitor: count as fully charge when at charge limit
When the user has set a charge limit, the expected definition of "fully charged" changes from "100%" to "the charge limit that I set". Accordingly, let's use the term "fully charged" to describe the current state when the battery is at the configured charge limit.
Unfortunately this involves a bit of code duplication in logic.js because the code in there to generate a charge status label is separate from the logic in main.qml that sets the label for the tooltip. At some point in the future, it would be nice to unify those.
| Tooltip | Label in popup |
|---|---|
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