fix(cmd/cel-key): Ensure keyring-backend is actually test by default (

celestiaorg#1879)

`KeysCommand` from the sdk is quite wonky in that it really only sets a
keyring backend if the flag was `changed`, so this hack ensures we can
properly set a default and that the default is `test`.

Resolves celestiaorg#1876

cmd/cel-key/main.go

@@ -8,6 +8,7 @@ import (
 	"github.com/cosmos/cosmos-sdk/client/config"
 	"github.com/cosmos/cosmos-sdk/client/flags"
 	"github.com/cosmos/cosmos-sdk/client/keys"
+	"github.com/cosmos/cosmos-sdk/crypto/keyring"
 	"github.com/cosmos/cosmos-sdk/x/auth/types"
 	"github.com/spf13/cobra"
 
@@ -46,6 +47,14 @@ func init() {
 			return err
 		}
 
+		if !cmd.Flag(flags.FlagKeyringBackend).Changed {
+			err = cmd.Flag(flags.FlagKeyringBackend).Value.Set(keyring.BackendTest)
+			if err != nil {
+				return err
+			}
+			cmd.Flag(flags.FlagKeyringBackend).Changed = true
+		}
+
 		return ParseDirectoryFlags(cmd)
 	}
 }