Mark As command does not update plant age

When you inspect any plant and manually change its `Planned` status to `Planted`, its age resets to 1 day old.

# Expected Behavior

When using the `Mark As` command to change a variable's `status` field to `Planted`, I expect it will reset the variable's age to 1 day old (if the variable is a plant, or a variable that has an `age` property).

# Actual Behavior

The plant is marked as `Planted` but its age remained the same as before.

# Steps to Reproduce

1. Add plant to garden.
2. Set plant status to `Planned`.
3. Set plant age to older than 1 day.
4. Add plant to new group.
5. Create a sequence with a `Mark As` command that marks a location variable as `status: planted`.
6. Set sequence location variable to externally defined.
7. Call sequence, specify the group created in step 4.