fix-02: reset grace period if is a tie

[fforbeck]

If a new vote result is submitted and it changes the result status from PASS to TIE, the grace period is not reset. A TIE should not be treated as the same as a NOT_PASS, otherwise any member can abuse it to deny vote proposals before execution.

Proposed Changes

• Reset the grace period if the last vote result status is a TIE.

[codecov]

Codecov Report

Merging #508 (e526ef6) into master (bef1c72) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #508   +/-   ##
=======================================
  Coverage   82.27%   82.27%           
=======================================
  Files          53       53           
  Lines        1851     1851           
  Branches      430      430           
=======================================
  Hits         1523     1523           
  Misses        328      328           

Impacted Files	Coverage Δ
contracts/adapters/voting/OffchainVoting.sol	41.25% <ø> (ø)

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