If the entered 'simulation id' isn't proper, ask again.

Before, the following exception was thrown : 
```
[] nre@~/Desktop/gatling-charts-highcharts-2.0.0-M3a/bin: ./gatling.sh 
GATLING_HOME is set to /home/nre/Desktop/gatling-charts-highcharts-2.0.0-M3a
basic.ItrNihonSimulation is the only simulation, executing it.
Select simulation id (default is 'itrnihonsimulation'). Accepted characters are a-z, A-Z, 0-9, - and _
^[[A
Exception in thread "main" java.lang.IllegalArgumentException: requirement failed: [A contains illegal characters
	at scala.Predef$.require(Predef.scala:233)
	at io.gatling.app.Gatling.io$gatling$app$Gatling$$interactiveSelect$1(Gatling.scala:137)
	at io.gatling.app.Gatling$$anonfun$18$$anonfun$21.apply(Gatling.scala:186)
	at io.gatling.app.Gatling$$anonfun$18$$anonfun$21.apply(Gatling.scala:186)
	at scala.Option.getOrElse(Option.scala:120)
	at io.gatling.app.Gatling$$anonfun$18.apply(Gatling.scala:186)
	at io.gatling.app.Gatling$$anonfun$18.apply(Gatling.scala:180)
	at scala.Option.getOrElse(Option.scala:120)
	at io.gatling.app.Gatling.start(Gatling.scala:180)
	at io.gatling.app.Gatling$.fromMap(Gatling.scala:59)
	at io.gatling.app.Gatling$.runGatling(Gatling.scala:80)
	at io.gatling.app.Gatling$.main(Gatling.scala:54)
	at io.gatling.app.Gatling.main(Gatling.scala)
```