Fix #219

Don't set default for "slowDeviceMode" arg because doing so prevents "dotenv" from setting that value even if it's in your .env file (it's a key design criteria of dotenv to not override any existing value). The default value is already set in config.js, so we're fine just dropping it here.

bin/cli.js

@@ -65,7 +65,7 @@ const args = require('meow')(`
 			electrumxServers: {alias:'E'},
 			nodeEnv: {alias:'e', default:'production'},
 			privacyMode: {type:'boolean'},
-			slowDeviceMode: {type:'boolean', default:true}
+			slowDeviceMode: {type:'boolean'}
 		}
 	}
 ).flags;