Keep the Minimal HUD readout clear of the attribution row

The bottom-left MGRS / lat-lon readout sat 5.4rem up while the Cesium /
Esri credits row, logo included, reaches about 6.75rem, so the two
overlapped. Raise it to 7.25rem and drop the Scope-off override: the
backplates add no vertical padding, so both modes now leave the same gap.

changelog.d/1523-minimal-hud-bottom-banner.md

@@ -1,3 +1,3 @@
 - The Minimal HUD layout no longer draws the centred MGRS / LAT / LON banner
-  across the globe; the bottom-left readout still shows the same position
-  (#1523).
+  across the globe; the bottom-left readout still shows the same position, and
+  now sits clear of the map attribution row instead of overlapping it (#1523).