Use the location pointer for the Closest label

The Closest label was drawing location.north.fill. A north arrow reads as a
bearing — it implies direction of travel toward something, which is the wrong
idea for a label that means "this is the station nearest you". The plain
location pointer says where a place is without implying a heading, and it is
already the glyph the app's other location affordances draw in Settings and on
the map.

One constant, as before: StationLabelKind.closest.symbol. The badge, the Key
legend and both verdict symbols reference it, so nothing else needed touching.

The test that pins each label's glyph now expects "location"; its north-arrow
expectation was the only failure in the suite. The comment above the verdict
symbol still described a north arrow and now describes the pointer.

Also bumps CURRENT_PROJECT_VERSION 30 -> 31 for this device install round.

Tests: 278 pass.

FuelBoard/FuelSavingsViews.swift

@@ -158,7 +158,7 @@ struct FuelSavingsCapsule: View {
         // The ONE closest glyph, shared with the Key legend and the station
         // badges (`StationLabelKind.closest`). The other three verdicts are
         // circular because they report an outcome; closest reports a position,
-        // and a north arrow is what the legend teaches for it.
+        // and the plain location pointer is what the legend teaches for it.
         case .baseline: return StationLabelKind.closest.symbol
         }
     }