dumpling database with -B flag failed

[echehee]

What did you do?

dumpling database using following commmand:
tiup dumpling --host -u -p -P -B -o

What did you expect to see?

database being exported

What did you see instead?

Following error message:
Error: use tiup install <database> to install component <database> first: component not installed.

If we use --database instead of -B, dumpling commond is executed successfully.

Versions of the cluster

Release version: v5.1.2
Git commit hash: 0d8ccce
Git branch: heads/refs/tags/v5.1.2
Build timestamp: 2021-09-27 02:47:55Z
Go version: go version go1.16.4 linux/amd64

[lichunzhu]

#312
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