The command path sent for `docker build` should be `docker` rather than
`docker build` to be consistent with the other command paths.
* `docker buildx build` has a command path of `docker buildx`
* `docker builder build` has a command path of `docker builder`
* `docker image build` has a command path of `docker image`
The reason this gets set to `docker buildx` rather than `docker buildx
build` is because the `build` portion of the command path is processed
by the plugin. So the command path only contains the portions of the
command path that were processed by this tool.
Since the `build` of `docker build` gets forwarded to `buildx`, it is
not included in the command path.
Signed-off-by: Jonathan A. Sternberg <jonathan.sternberg@docker.com>
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