Update ApplePassbookQuirkCorrector.java

This should format the main title to be something like
`VALENC.JSO -> MADRID-P.A`
Which indicates the city/train terminal for source and destination

given the Json:
```
{
	"formatVersion":1,
	...
	"organizationName":"RENFE OPERADORA",
	"description":"Billete de tren",
	...
	"boardingPass":{
		"headerFields":[{"key":"destinofecha","label":"Viaje a: MADRID-P.A","value":"20/06/2014"}],
		"primaryFields":[
			{"key":"boardingTime","label":"VALENC.JSO","value":"17:10","changeMessage":"La hora de salida ha cambiado a %@"},
			{"key":"destino","label":"MADRID-P.A","value":"18:48"}],
	...
```

Please note this code has not been tested.