Fix invalid syntax in example-config.json

[PeterChen13579]

remove "." fixes syntax for example-config; runs with ./clio_server

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 67.88%. Comparing base (c569984) to head (a011a99).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #1423 +/- ## ======================================== Coverage 67.88% 67.88% ======================================== Files 232 232 Lines 9335 9335 Branches 5210 5210 ======================================== Hits 6337 6337 Misses 1638 1638 Partials 1360 1360 ```

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