Holding spacebar to tend to crops doesn't work while mounted

Crops can still be tended to with the mouse while mounted, which suggests that this behaviour is unintended.

How to fix:

1. Add the "tendable_farmplant" tag to the PICKUP_TAGS table that is located on line 73 of components/rider_replica.lua
2. Add the same elseif check that is on lines 1468-1469 of components/playercontroller.lua to the GetPickupAction function on line 51 of components/rider_replica.lua
3. Change self.inst:HasTag("mime") to inst:HasTag("mime") since the GetPickupAction function doesn't take self as an argument