Clear the list of scenario content before getting the next list of co…

…ntent.

Otherwise each scenario keeps appending additional and usually duplicate content being sent to the server.

src/game_initialization/playcampaign.cpp

@@ -361,8 +361,11 @@ LEVEL_RESULT campaign_controller::play_game()
 				return LEVEL_RESULT::QUIT;
 			}
 
-			// The host should send the complete savegame now that also contains the carryvoer sides start.
+			// The host should send the complete savegame now that also contains the carryover sides start.
 		} else {
+			// clear previous game content information
+			// otherwise it keeps getting appended for each scenario resulting in incorrect data being sent to the server to be stored
+			state_.mp_settings().addons.clear();
 			// Retrieve next scenario data.
 			state_.expand_scenario();
 

src/saved_game.cpp

@@ -380,7 +380,7 @@ void saved_game::expand_mp_events()
 		);
 
 		// We don't want the error message below if there is no era (= if this is a sp game).
-		if(!classification_.era_id .empty()) {
+		if(!classification_.era_id.empty()) {
 			mods.emplace_back("era", classification_.era_id);
 		}