Fix Statemine ss58 prefixes. (#829)

* Fix Statemine prefix

* Add prefix to chain spec

cumulus/polkadot-parachains/res/statemine.json

@@ -10,6 +10,7 @@
   "telemetryEndpoints": null,
   "protocolId": null,
   "properties": {
+    "ss58Format": 2,
     "tokenDecimals": 12,
     "tokenSymbol": "KSM"
   },

cumulus/polkadot-parachains/res/statemine_genesis.json

@@ -8,6 +8,7 @@
   "telemetryEndpoints": null,
   "protocolId": null,
   "properties": {
+    "ss58Format": 2,
     "tokenDecimals": 12,
     "tokenSymbol": "KSM"
   },

cumulus/polkadot-parachains/src/chain_spec.rs

@@ -352,6 +352,7 @@ fn statemint_genesis(
 
 pub fn statemine_development_config() -> StatemineChainSpec {
 	let mut properties = sc_chain_spec::Properties::new();
+	properties.insert("ss58Format".into(), 2.into());
 	properties.insert("tokenSymbol".into(), "KSM".into());
 	properties.insert("tokenDecimals".into(), 12.into());
 
@@ -387,6 +388,7 @@ pub fn statemine_development_config() -> StatemineChainSpec {
 
 pub fn statemine_local_config() -> StatemineChainSpec {
 	let mut properties = sc_chain_spec::Properties::new();
+	properties.insert("ss58Format".into(), 2.into());
 	properties.insert("tokenSymbol".into(), "KSM".into());
 	properties.insert("tokenDecimals".into(), 12.into());
 
@@ -436,6 +438,7 @@ pub fn statemine_local_config() -> StatemineChainSpec {
 
 pub fn statemine_config() -> StatemineChainSpec {
 	let mut properties = sc_chain_spec::Properties::new();
+	properties.insert("ss58Format".into(), 2.into());
 	properties.insert("tokenSymbol".into(), "KSM".into());
 	properties.insert("tokenDecimals".into(), 12.into());