allows taking bonus with already a sender bonus

Bonus.cpp

@@ -12,6 +12,8 @@ void Bonus::action_on_display() {
 }
 
 void Bonus::action_on_take(Ball *ball) {
+    if(ball->sender->bonus)
+        return;
     ball->sender->bonus = this;
     state = IN_USE;
 }
@@ -184,9 +186,12 @@ LifeAddBonus::LifeAddBonus() : Bonus(LIFE_ADD_BONUS_LENGTH, LIFE_ADD_BONUS_PROBA
 
 void LifeAddBonus::action_on_take(Ball *ball) {
     ball->sender->life_points++;
-    if(!ball->bonus)
+    if(ball->bonus) {
+        state = NONE;
+    } else {
         ball->bonus = this;
-    state = IN_USE;
+        state = IN_USE;
+    }
 }
 
 bool LifeAddBonus::can_be_added() {

Game.cpp

@@ -87,7 +87,7 @@ void Game::pingpong() {
 
         ball->display();
 
-        if(!ball->sender->bonus && ball->sender->pressing)
+        if(ball->sender->pressing)
             check_for_bonus(ball);
 
         if(ball->receiver->send_back(ball)) {