MN reward (tx) timestamps aren't right

[crypt0biwan]

Can you reliably reproduce the issue? yes

If so, please list the steps to reproduce below:

1. Close wallet (which has a MN configured)
2. After a certain amount of time, let's say 4h open the wallet again
3. You'll see MN transactions coming in with the same date/time

Expected behavior

transactions should have a different timestamp based on the block which contains it

Actual behavior

transaction timestamp is from when the wallet synced the transaction

Screenshots.

What version of MonetaryUnit Core are you using?

2.0.2

Machine specs:

• OS: Windows 10 64bit
• CPU: Intel i7
• RAM: 16GB
• Disk size: 256GB
• Disk Type (HD/SDD): SSD