fix(proxy-ssh,start): correct call from 'usage' to 'proxy_usage'
fix(proxy-ssh,start): correct call from 'usage' to 'proxy_usage'

Signed-off-by: Edouard Lopez <492283376763148288091dc1edb13b1b4edf3d1b@edouard-lopez.com>

edouard-lopez/sshuttle-helper