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

Author: PolterTzi

Content.Server/Botany/Systems/PlantHolderSystem.cs

@@ -621,6 +621,7 @@ public void Update(EntityUid uid, PlantHolderComponent? component = null)
             RemovePlant(uid, component);
             component.ForceUpdate = true;
             Update(uid, component);
+            return;
         }
 
         CheckHealth(uid, component);