templates/user/auth/login: disable password autocomplete (#5068)
templates/user/auth/login: disable password autocomplete (#5068)

As gogs can be linked with PAM it is recommended to disable the autocomplete on the password input.
gogits/gogs,chriswatt/gogs,mukaiu/gogs,mukaiu/gogs,mukaiu/gogs,gogits/gogs,gogits/gogs,chriswatt/gogs,chriswatt/gogs