Add EGF PIN to h9 export

Append EGF PIN at end of player line with | separator (e.g. |12345678)
when the player has a valid 8-character EGF PIN

api-webapp/src/main/kotlin/org/jeudego/pairgoth/api/StandingsHandler.kt

@@ -148,6 +148,8 @@ ${
             player.getArray("results")!!.map {
                 (it as String).padStart(8, ' ')
             }.joinToString(" ")
+        }${
+            player.getString("egf")?.let { if (it.length == 8) " |$it" else "" } ?: ""
         }"
     }
 }