fix(CLI): "pnpm -h <cmd>" prints help for <cmd>
fix(CLI): "pnpm -h <cmd>" prints help for <cmd>

Before this changes, "pnpm -h <cmd>" was printing the general help.
"pnpm <cmd> -h" worked correctly.

rstacruz/pnpm,rstacruz/pnpm,pnpm/pnpm,rstacruz/pnpm,pnpm/pnpm,pnpm/pnpm