internal: move eth_config defn from web3.js to web3ext.go

internal/jsre/deps/web3.js

@@ -5491,10 +5491,6 @@ var properties = function () {
             name: 'protocolVersion',
             getter: 'eth_protocolVersion'
         }),
-        new Property({
-          name: 'config',
-          getter: 'eth_config'
-        })
     ];
 };
 

internal/web3ext/web3ext.go

@@ -595,6 +595,11 @@ web3._extend({
 			call: 'eth_getBlockReceipts',
 			params: 1,
 		}),
+		new web3._extend.Method({
+			name: 'config',
+			call: 'eth_config',
+			params: 0,
+		})
 	],
 	properties: [
 		new web3._extend.Property({