Fix issue with calculating town lighting, and do it on load instead of save since the new format doesn't store it

src/classes/town.cpp

@@ -225,8 +225,8 @@ void cTown::set_up_lights() {
 							where_lit[where.x][where.y] = true;
 			}
 		}
-	for(short i = 0; i < 8; i++)
-		for(short j = 0; j < 64; j++)
+	for(short i = 0; i < this->max_dim() / 8; i++)
+		for(short j = 0; j < this->max_dim(); j++)
 			this->lighting(i,j) = 0;
 	for(where.x = 0; where.x < this->max_dim(); where.x++)
 		for(where.y = 0; where.y < this->max_dim(); where.y++) {

src/scenedit/scen.main.cpp

@@ -197,7 +197,6 @@ void handle_menu_choice(eMenu item_hit) {
 			}
 			break;
 		case eMenu::FILE_SAVE:
-			town->set_up_lights();
 			save_scenario(scenario.scen_file);
 			break;
 		case eMenu::FILE_NEW:

src/tools/fileio_scen.cpp

@@ -398,6 +398,9 @@ bool load_town_v1(fs::path scen_file, short which_town, cTown& the_town, legacy:
 	// Do this after strings are loaded because porting shops requires access to strings
 	the_town.talking.append(store_talk, shops);
 	
+	// And lastly, calculate lighting
+	the_town.set_up_lights();
+	
 	n = fclose(file_id);
 	if(n != 0) {
 		oopsError(18, 0, 0);