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Total relayer count may be wrong fix (4.10 – medium) (#147)

* adds a require checking if address already has a relayer role, or already doesn't have a relayer role before removing or adding a relayer respectively
* updates tests to reflect this and adds 2 new tests for the new conditions.

64 of 94 branches covered (68.09%)

Branch coverage included in aggregate %.

236 of 250 relevant lines covered (94.4%)

26.11 hits per line