fix(test): Update the reference Sapling treestate (#9051)

* Update the reference Sapling treestate

Zebra's treestate serialization differs from `zcashd` in the following
way:

`zcashd` omits the serialization of empty trailing ommers, while Zebra
doesn't. This means that `zcashd` serializes the Sapling treestate for
height 419_201 as

019eb30778ddeea84c72e69e07a1689f3c8def3dc0a1939f0edcbe47279069d9310002000150715810d52caf35471d10feb487213fbd95ff209122225b7b65d27a7fb1a44d

Whereas Zebra serializes it as

019eb30778ddeea84c72e69e07a1689f3c8def3dc0a1939f0edcbe47279069d931001f000150715810d52caf35471d10feb487213fbd95ff209122225b7b65d27a7fb1a44d0000000000000000000000000000000000000000000000000000000000

Serialization Format
====================

The serialized treestate consists of optional, hex-encoded, 32-byte
hashes. If the hash is not present, it is serialized as byte 0, i.e.,
`0x00`. If the hash is present, it is prefixed by byte 1, i.e. `0x01`.
The first two hashes in the serialized treestate are the treestate's
left and right leaves. These are followed by the serialized length of
the vector of ommers. This length is serialized as 1, 3, 5, or 9 bytes.
If the length is less than 253, it is serialized as a single byte. The
length is then followed by the serialized ommers.

We can now parse the first string, produced by `zcashd`:

- `0119eb30778ddeea84c72e69e07a1689f3c8def3dc0a1939f0edcbe47279069d931`
  is the serialized left leaf,
- `00` is the serialized right leaf,
- `02` is the serialized length of the vector of ommers,
- `00` is the serialized first ommer,
- `0150715810d52caf35471d10feb487213fbd95ff209122225b7b65d27a7fb1a44d`
  is the serialized second ommer.

And the second one, produced by Zebra:

- `0119eb30778ddeea84c72e69e07a1689f3c8def3dc0a1939f0edcbe47279069d931`
  is the serialized left leaf,
- `00` is the serialized right leaf,
- `1f` is the serialized length of the vector of ommers,
- `00` is the serialized first ommer,
- `0150715810d52caf35471d10feb487213fbd95ff209122225b7b65d27a7fb1a44d`
  is the serialized second ommer
- `0000000000000000000000000000000000000000000000000000000000` are the
  remaining 29 serialized ommers.

Note that both serializations represent the same treestate.

* Remove a new line char

zebra-test/src/vectors/sapling-treestate-main-0-419-201.txt

@@ -1 +1 @@
-019eb30778ddeea84c72e69e07a1689f3c8def3dc0a1939f0edcbe47279069d9310002000150715810d52caf35471d10feb487213fbd95ff209122225b7b65d27a7fb1a44d
+019eb30778ddeea84c72e69e07a1689f3c8def3dc0a1939f0edcbe47279069d931001f000150715810d52caf35471d10feb487213fbd95ff209122225b7b65d27a7fb1a44d0000000000000000000000000000000000000000000000000000000000