inspect: fix printing of driver options

[crazy-max]

follow-up #1003 (comment)

current behavior:

Name:   builder
Driver: docker-container

Nodes:
Name:            builder0
Endpoint:        unix:///var/run/docker.sock
Driver Options:  env.BUILDKIT_STEP_LOG_MAX_SIZE=-1
,                env.BUILDKIT_STEP_LOG_MAX_SPEED=-1
,                env.JAEGER_TRACE=localhost:6831
,                image=moby/buildkit:master
,                network=host
Status:          running
Flags:           --debug --allow-insecure-entitlement security.insecure --allow-insecure-entitlement network.host
Platforms:       linux/amd64, linux/amd64/v2, linux/amd64/v3, linux/arm64, linux/riscv64, linux/ppc64le, linux/s390x, linux/386, linux/mips64le, linux/mips64, linux/arm/v7, linux/arm/v6

now:

Name:   builder
Driver: docker-container

Nodes:
Name:           builder0
Endpoint:       unix:///var/run/docker.sock
Driver Options: env.BUILDKIT_STEP_LOG_MAX_SIZE="-1" env.BUILDKIT_STEP_LOG_MAX_SPEED="-1" env.JAEGER_TRACE="localhost:6831" image="moby/buildkit:master" network="host"
Status:         running
Flags:          --debug --allow-insecure-entitlement security.insecure --allow-insecure-entitlement network.host
Platforms:      linux/amd64, linux/amd64/v2, linux/amd64/v3, linux/arm64, linux/riscv64, linux/ppc64le, linux/s390x, linux/386, linux/mips64le, linux/mips64, linux/arm/v7, linux/arm/v6

Signed-off-by: CrazyMax crazy-max@users.noreply.github.com