performance tests error in `test_aggregated_bulletproof_plus`

[jeffro256]

On the sixth and final test_aggregated_bulletproof_plus performance test instance here, an exception is thrown with the message: sv/gamma are too large. The assertion statement can be found here, but I don't know enough about bulletproofs to debug it.

[UkoeHB]

Oh it only allows 16 range proofs to be aggregated, since that's the max number of outputs in ringct. At one point I was perf testing more than that (as you can see, that test is doing 32 aggregated proofs). That test can be deleted.

[UkoeHB]

Removed the broken tests.