Fix `subkey inspect` output text padding (#1744)

This pull request is to fix the output text misalignment of `subkey
inspect` command:

(the `Network ID` line has an extra space at the end, and the `Secret
seed` line lacks a leading space)

```
[btwiuse@railway ~]$ subkey inspect '' | cat -A
Secret Key URI `` is account:$
  Network ID:        substrate $
 Secret seed:       0xfac7959dbfe72f052e5a0c3c8d6530f202b02fd8f9f5ca3580ec8deb7797479e$
  Public key (hex):  0x46ebddef8cd9bb167dc30878d7113b7e168e6f0646beffd77d69d39bad76b47a$
  Account ID:        0x46ebddef8cd9bb167dc30878d7113b7e168e6f0646beffd77d69d39bad76b47a$
  Public key (SS58): 5DfhGyQdFobKM8NsWvEeAKk5EQQgYe9AydgJ7rMB6E1EqRzV$
  SS58 Address:      5DfhGyQdFobKM8NsWvEeAKk5EQQgYe9AydgJ7rMB6E1EqRzV$
```

The output should be in the same YAML-like format as `subkey generate`:

```
[btwiuse@railway ~]$ subkey generate  | cat -A
Secret phrase:       awkward eagle survey resemble novel resist modify memory pistol shed flower run$
  Network ID:        substrate$
  Secret seed:       0x20502f79366325b7dc7620664e8844ae69d441baf6e5b571a57d3b3ff28e9586$
  Public key (hex):  0x468874b9e5b6b77333fa702b9201b924d6834bf956e33e2bbe37d131134ca830$
  Account ID:        0x468874b9e5b6b77333fa702b9201b924d6834bf956e33e2bbe37d131134ca830$
  Public key (SS58): 5DfBkAMg5xQmsePFr3BWLZm99smiNyy9axWSgembvFgDKh9v$
  SS58 Address:      5DfBkAMg5xQmsePFr3BWLZm99smiNyy9axWSgembvFgDKh9v$
```

This change will fix `subkey` as well as all binaries that embed it as
the `key` subcommand, for example: `substrate key`, `polkadot key`, etc.

---------

Co-authored-by: Liam Aharon <[email protected]>