ajout de la porte et équilibrage des mutations

entities/plants/scripts/plant_mutation/fertile_mutation.gd

@@ -2,10 +2,7 @@ extends PlantMutation
 class_name FertileMutation
 
 func get_icon() -> Texture:
-    return preload("res://common/icons/chevrons-up.svg")
-
-func get_base_rarity() -> int:
-    return 0
+    return preload("res://common/icons/seedling.svg")
 
 func get_mutation_id() -> String:
     return "FERTILE"
@@ -16,6 +13,5 @@ func get_mutation_name() -> String:
 func get_mutation_description() -> String:
     return tr("FERTILE_EFFECT_TEXT_LEVEL_%d") % level
 
-func mutate_lifetime(_plant_data : PlantData, lifetime : int) -> int:
-    print("TODO:: Implemnt FERTILE lifetime based on plants around")
-    return lifetime + level
+func mutate_seed_buff(_plant_data: PlantData) -> int:
+    return level