Update power item properties

Flame Shield:
- Not near end
Garden Top:
- Not at start
- Not near end
- Is a power item

src/k_roulette.c

@@ -812,10 +812,18 @@ INT32 K_KartGetItemOdds(const player_t *player, itemroulette_t *const roulette,
 		case KITEM_MINE:
 		case KITEM_GROW:
 		case KITEM_BUBBLESHIELD:
+		{
+			conditions.cooldownOnStart = true;
+			conditions.powerItem = true;
+			break;
+		}
+
 		case KITEM_FLAMESHIELD:
+		case KITEM_GARDENTOP:
 		{
 			conditions.cooldownOnStart = true;
 			conditions.powerItem = true;
+			conditions.notNearEnd = true;
 			break;
 		}