This PR fixes 2 more Unit tests. Unit tests are the most important C++ tests located in the src folder and are what first runs when you make check. This fixes policy_fee_tests.cpp & transaction_tests.cpp.

You can read more about Unit Tests here:
https://github.com/DigiByte-Core/digibyte/blob/develop/src/test/README.md

To Compile & Run Unit Tests:

  ./autogen.sh
  ./configure
  make -j 8
  make check

Run Specific Unit Test Fixed

cd src/test
./test_digibyte --run_test=transaction_tests
./test_digibyte --run_test=policy_fee_tests

Explanation of Changes In policy_fee_tests.cpp

1. 974 changed to 0:

• In the original test case, the fee rate was set to 10000, and the expected rounded value for 1000 was 974.
• However, after updating the fee rate to 100000 (10 times higher), the rounding logic changed.
• With the new fee rate, the rounded value for 1000 becomes 0 because 1000 is less than the minimum fee unit of 100000.
• Therefore, the expected value was updated from 974 to 0 to reflect the new rounding behavior.

2. 1071 changed to 50000:

• Similar to the previous change, the original expected value of 1071 was based on the fee rate of 10000.
• With the updated fee rate of 100000, the rounding logic changed, and the expected value needed to be adjusted.
• The new expected value of 50000 was determined by running the test and observing the actual rounded value.
• The test case checks that the rounded value for 1000 should be either 0 or another value (previously 1071, now 50000).
• The actual rounded value turned out to be 50000 with the new fee rate, so the expected value was updated accordingly.

3. 9170997 changed to 9936506125:

• The original expected value of 9170997 for rounding MAX_MONEY was based on the fee rate of 10000.
• With the updated fee rate of 100000, the rounding behavior for MAX_MONEY changed as well.
• The new expected value of 9936506125 was determined by running the test and observing the actual rounded value.
• The test case checks that rounding MAX_MONEY should equal the expected value, which was previously 9170997 but is now 9936506125 with the new fee rate.

After this PR make check now fails on: wallet_tests.cpp

So we need to approve: #180