Better Query display name

app/src/main/java/net/pokeranalytics/android/model/filter/Query.kt

@@ -52,7 +52,7 @@ class Query {
 	fun getName(context: Context): String {
 		return when (this._conditions.size) {
 			0 -> context.getString(R.string.all_sessions) // @todo should be dependant of the underlying type, ie. Session, Transaction...
-			else -> this._conditions.joinToString(" : ") { it.getDisplayName(context) }
+			else -> this._conditions.joinToString(" + ") { it.getDisplayName(context) }
 		}
 	}