fix(guild-kick): can not kick yourself using a delegate

[fforbeck]

Proposed Changes

• A member should not be able to submit a kick proposal to kick his/her own account, even if proposal was submitted using his/her delegate account.

[codecov[bot]]

Codecov Report

Merging #529 (78771ec) into master (7f1901c) will not change coverage. The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #529   +/-   ##
=======================================
  Coverage   85.59%   85.59%           
=======================================
  Files          52       52           
  Lines        1867     1867           
  Branches      438      438           
=======================================
  Hits         1598     1598           
  Misses        269      269           

Impacted Files	Coverage Δ
contracts/adapters/GuildKick.sol	95.65% <100.00%> (ø)

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