fixed the specific if statement called when plant age is under 0 (#25346)

(cherry picked from commit 5b485fedbd6f41ffb82343f1f6cbb7113ce6284f)

Content.Server/Botany/Systems/PlantHolderSystem.cs

@@ -621,6 +621,7 @@ public sealed class PlantHolderSystem : EntitySystem
             RemovePlant(uid, component);
             component.ForceUpdate = true;
             Update(uid, component);
+            return;
         }
 
         CheckHealth(uid, component);