Prepare withdraw routes part of the HP managament

Requires: !306 (merged)

clive/__private/ui/operations/hive_power_management/power_down/power_down.py

@@ -101,7 +101,7 @@ class PendingPowerDown(CliveCheckerboardTable):
                 CliveCheckerBoardTableCell(humanize_datetime(content.next_vesting_withdrawal)),
                 CliveCheckerBoardTableCell(Asset.pretty_amount(content.next_power_down.hp_balance)),
                 CliveCheckerBoardTableCell(Asset.pretty_amount(content.next_power_down.vests_balance)),
-                CliveButton("Cancel", variant="error"),
+                CliveCheckerBoardTableCell(CliveButton("Cancel", variant="error")),
             )
         ]