`edgedb instance credentials` prints a table containing `Database` even on a 5.0 beta database

[raddevon]

edgedb instance credentials output on a 5.0-beta.2+796ed0e database under CLI 4.3.0-dev.1117+2dfb53b:

┌──────────────┬───────────┐
│ Host         │ localhost │
│ Port         │ 10913     │
│ User         │ edgedb    │
│ Password     │ <hidden>  │
│ Database     │ edgedb    │
│ TLS Security │ Default   │
└──────────────┴───────────┘

I guess we should label the row "Database" for pre-5 databases and "Branch" for 5+. Same for the JSON output and its "database" key.