Use AC input current limit for AC input widget gauge if applicable

If units are shown in amps, use the AC input's current limit as
the maximum gauge value in the Overview page.

This makes the implementation consistent with what is already done
for the AC inputs gauge on the Brief page.

components/widgets/AcInputWidget.qml

@@ -36,6 +36,9 @@ OverviewWidget {
 			id: valueRange
 
 			value: sideGauge.visible ? root.quantityLabel.value : NaN
+			maximumValue: Global.systemSettings.electricalQuantity.value === VenusOS.Units_Amp
+				? Global.acInputs.currentLimit
+				: NaN
 		}
 	}