[ISO] Fix display update issues in ManualPartitionWidget (#1249)

* Refresh title when backing out of add partition page

* Fix display of incorrect disk's space remaining

Author: oliviacrain

toolkit/tools/imagegen/attendedinstaller/views/diskview/manualpartitionwidget/manualpartitionwidget.go

@@ -255,6 +255,7 @@ func (mp *ManualPartitionWidget) HandleInput(event *tcell.EventKey) *tcell.Event
 			return tcell.NewEventKey(tcell.KeyTab, 0, tcell.ModNone)
 		case tcell.KeyEsc:
 			mp.pages.HidePage(addPartitionPage)
+			mp.refreshTitle()
 		}
 	} else {
 		// The front page is the partition table
@@ -309,9 +310,14 @@ func (mp *ManualPartitionWidget) Primitive() tview.Primitive {
 	return mp.pages
 }
 
-// SetSystemDeviceIndex updates the system device used
+// SetSystemDeviceIndex updates the system device used.
+// Panics if the space label cannot be updated.
 func (mp *ManualPartitionWidget) SetSystemDeviceIndex(index int) {
 	mp.deviceIndex = index
+
+	err := mp.updateSpaceLabel()
+	logger.PanicOnError(err, "Failed to update space label")
+
 	mp.flex.SetTitle(fmt.Sprintf(uitext.DiskAdvanceTitleFmt, mp.systemDevices[mp.deviceIndex].DevicePath))
 }