Fix release tar dirs

[fewensa]

Since #1358, the distribution package directory structure is wrong.

$ curl -LO https://github.com/darwinia-network/darwinia/releases/download/pango-6511/darwinia-x86_64-linux-gnu.tar.bz2
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0
100 65.0M  100 65.0M    0     0   325k      0  0:03:24  0:03:24 --:--:--  253k

$ tar -xvf darwinia-x86_64-linux-gnu.tar.bz2 -C ./
target/release/darwinia

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- Pallet: "EcdsaAuthority"
- Pallet: "MessageGadget"

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RuntimeVersion {
    spec_name: "Darwinia2",
    impl_name: "DarwiniaOfficialRust",
    authoring_version: 0,
-   spec_version: 6501,
+   spec_version: 6510,
    impl_version: 0,
    transaction_version: 0,
    state_version: 0,
}

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