Refactor: Simplify data dumping methods

- Remove unnecessary nesting by returning early when deleting all data.
- Remove deprecated `EXPORT_ORIGINAL_ID` field.

Author: mmathieum

src/main/java/org/mtransit/parser/DefaultAgencyTools.java

@@ -80,8 +80,6 @@ public class DefaultAgencyTools implements GAgencyTools {
 	private static final int MIN_PREVIOUS_NEXT_ADDED_DAYS = 2;
 
 	public static final boolean EXPORT_TRIP_ID;
-	@Deprecated
-	public static final boolean EXPORT_ORIGINAL_ID = false;
 
 	static {
 		EXPORT_TRIP_ID = false;