Rescale town cargo adj setting by 10x, for finer adjustment.

Use DECIMAL1 instead of an integer.

src/settings_gui.cpp

@@ -1765,7 +1765,7 @@ static SettingsContainer &GetSettingsTree()
 				towns->Add(new SettingEntry("economy.allow_town_roads"));
 				towns->Add(new SettingEntry("economy.allow_town_level_crossings"));
 				towns->Add(new SettingEntry("economy.found_town"));
-				towns->Add(new SettingEntry("economy.town_cargo_factor"));
+				towns->Add(new SettingEntry("economy.town_cargo_scale_factor"));
 				towns->Add(new SettingEntry("economy.random_road_reconstruction"));
 			}