Incorrect witness participation rate in logs

**Bug Description**

Noticed log message like this:
>Not producing block because node appears to be on a minority fork with only 2734% witness participation

It's incorrect because 2734% is greater than 100% .

**Impacts**
Describe which portion(s) of BitShares Core may be impacted by this bug. Please tick at least one box.
- [ ] API (the application programming interface)
- [ ] Build (the build process or something prior to compiled code)
- [ ] CLI (the command line wallet)
- [ ] Deployment (the deployment process after building such as Docker, Travis, etc.)
- [ ] DEX (the Decentralized EXchange, market engine, etc.)
- [ ] P2P (the peer-to-peer network for transaction/block propagation)
- [ ] Performance (system or user efficiency, etc.)
- [ ] Protocol (the blockchain logic, consensus, validation, etc.)
- [ ] Security (the security of system or user data, etc.)
- [ ] UX (the User Experience)
- [x] Other (please add below) : logging

**Additional Context (optional)**
Add any other context about the problem here.

## CORE TEAM TASK LIST
- [ ] Evaluate / Prioritize Bug Report
- [ ] Refine User Stories / Requirements
- [ ] Define Test Cases
- [ ] Design / Develop Solution
- [ ] Perform QA/Testing
- [ ] Update Documentation

No file or test is named in the issue. Start by searching for the exact log message and tracing the witness-participation calculation; done means the reported percentage is correct and a regression check covers this logging case.

Written by the indexing model from the issue text.