Ore duping on completion of mining missions

[jessedewald]

Describe the bug
When completing mining missions, the mined ore are not taken from storage, instead remaining in station storage and ship cargo.

To Reproduce
Steps to reproduce the behavior:

1. Begin a mining mission where the total ore to complete the mission is more than you can fit in your cargo.
2. Mine a cargo-load full of ore. Return ore to station storage.
3. Go out and mine the rest of the required ore, observing that the "amount left" on the off-station mission screen decreases to 0.
4. Return to station and complete the mission without unloading the ore mined on second trip. At this point the mission will be completed with a credit reward, and the ore will remain in the station storage and ship's cargo.

Expected behavior
Ore should be taken from station cargo to complete mission. Additionally, mission should not be completeable until all of the ore is in storage on the agent's station.

Additional context
It seems like it's verifying mission completion based off of the way that the off-station mission screen determines "amount left." I would suggest changing the "amount left" indicator to refer to the amount left that still needs to be deposited in station storage, and the mission completion verification to strictly check the amount in storage.