Allow Tonnage Before Patrol Area

So often I run into a convoy on my way to the patrol area, then reach it with no torpedoes remaining, and then I'm still expected to meet a new quota as I reach it. With this mod tonnage sunk before reaching the patrol area is now counted toward your patrol tonnage. Note that this is only applied on generic patrols. Campaigns like Black Pit that have a designated objective area are not modified. This mod has been tested with 2025. 1, 2026. 1. This mod works with existing savegames and does not alter game state. Source for this mod is available here. https://github.com/shole/uboat-mods