contrib/openrc/i2pd.openrc: remove name

[fkobi]

That variable is no longer used:
https://github.com/OpenRC/openrc/blob/master/service-script-guide.md

[r4sas]

Have you tested it with whole bunch of targeted systems? OpenWRT and Entware included.

[fkobi]

no, I have not.
OpenWRT does not use OpenRC though:
https://openwrt.org/docs/techref/initscripts#example_init_script
Note the shebang.

Also I have asked the devs on IRC if this is needed:

<fkobi> when is the variable `name` used in the init scripts?
<navi> the default `start` and `stop` implementations for start-stop-daemon
       and supervise-daemon use it to print out `Starting $name`
<navi> if `name` is unset, it falls back to `RC_SVCNAME`
<fkobi> so if $name = $RC_SRVNAME there is no point in defining it?
<navi> correct

Here $name = $RC_SRVNAME so it should be removed.