Fix reaped Polkadot/Kusama test accounts via verified Treasury pallet account

Last remaining balances-test failures (2 of 112): both Polkadot and
Kusama's fixture account (inherited from upstream nova-utils) had
zero balance - reaped since the fixture was last updated, causing
"Balance was null" assertion failures. Not a CI/infra bug, not
related to Tron - genuinely stale test data.

Replaced with the Treasury pallet account (py/trsry) for both chains
- protocol-owned, continuously replenished from fees/inflation, never
reaped. This matches the fixture's own existing pattern (Moonbeam and
Moonriver both already use their crowdloan pallet account, not a
personal wallet).

The account (0x6d6f646c70792f74727372790000000000000000000000000000000000000000)
was independently verified two ways before use: derived by hand
(modl + py/trsry + zero padding) and cross-checked against
@polkadot/api's own derivation - both matched exactly - then its
balance was queried live against wss://rpc.polkadot.io (22,527,885,189,670
free) and wss://kusama-rpc.polkadot.io (25,368,610,181,623 free) to
confirm it's genuinely funded, not just plausible-looking.

Applied via a new pezkuwi-overlay/tests/account_overrides.json,
applied by sync_from_nova.py after the existing chain-filtering step,
rather than hand-editing the generated fixture output (which would be
overwritten on the next sync).

tests/chains_for_testBalance.json

@@ -7,12 +7,12 @@
   {
     "chainId": "91b171bb158e2d3848fa23a9f1c25182fb8e20313b2c1eb49219da7a70ce90c3",
     "name": "Polkadot",
-    "account": "0x7a28037947ecebe0dd86dc0e910911cb33185fd0714b37b75943f67dcf9b6e7c"
+    "account": "0x6d6f646c70792f74727372790000000000000000000000000000000000000000"
   },
   {
     "chainId": "b0a8d493285c2df73290dfb7e61f870f17b41801197a149ca93654499ea3dafe",
     "name": "Kusama",
-    "account": "0x7a28037947ecebe0dd86dc0e910911cb33185fd0714b37b75943f67dcf9b6e7c"
+    "account": "0x6d6f646c70792f74727372790000000000000000000000000000000000000000"
   },
   {
     "chainId": "e143f23803ac50e8f6f8e62695d1ce9e4e1d68aa36c1cd2cfd15340213f3423e",