i2ptunnel: Change enc type defaults

ECIES (ratchet) introduced about 4 years ago, and we are still defaulting to both ECIES and ElG in most places.

There are four cases:

- New install: $I2P/i2ptunnel.config as shipped
- New tunnel: i2ptunnel code sets default
- Existing tunnel, no enc type config: i2ptunnel code sets default
- Existing tunnel, config changed and saved via UI in last 4 years: Setting as in config file

Changes:

- New install: Change eepsite and IRC client to ECIES-only; shared clients remains both
- New tunnel: Change from both to ECIES-only
- Existing tunnel, no enc type config: Change servers to ECIES-only; clients remain both
- Existing tunnel with enc type config: No defaults, no change

installer/resources/i2ptunnel.config

@@ -55,7 +55,7 @@ tunnel.1.option.i2cp.closeIdleTime=1200000
 tunnel.1.option.i2cp.closeOnIdle=true
 tunnel.1.option.i2cp.delayOpen=true
 tunnel.1.option.i2cp.destination.sigType=7
-tunnel.1.option.i2cp.leaseSetEncType=4,0
+tunnel.1.option.i2cp.leaseSetEncType=4
 tunnel.1.option.i2cp.newDestOnResume=false
 tunnel.1.option.i2cp.reduceIdleTime=600000
 tunnel.1.option.i2cp.reduceOnIdle=true
@@ -82,7 +82,7 @@ tunnel.3.i2cpPort=7654
 tunnel.3.option.inbound.nickname=eepsite
 tunnel.3.option.outbound.nickname=eepsite
 tunnel.3.option.i2cp.destination.sigType=7
-tunnel.3.option.i2cp.leaseSetEncType=4,0
+tunnel.3.option.i2cp.leaseSetEncType=4
 tunnel.3.option.inbound.length=3
 tunnel.3.option.inbound.lengthVariance=0
 tunnel.3.option.outbound.length=3