Add access token modifier to public withdraw or cancel functions

[byshape]

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[codecov]

Codecov Report

Attention: Patch coverage is 28.57143% with 5 lines in your changes missing coverage. Please review.

Project coverage is 59.86%. Comparing base (7b8d3f7) to head (f909715).
Report is 5 commits behind head on master.

Files	Patch %	Lines
contracts/EscrowFactory.sol	0.00%	2 Missing ⚠️
contracts/zkSync/EscrowFactoryZkSync.sol	0.00%	2 Missing ⚠️
contracts/BaseEscrow.sol	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #105      +/-   ##
==========================================
- Coverage   64.28%   59.86%   -4.42%     
==========================================
  Files          16       16              
  Lines         154      152       -2     
  Branches       22       21       -1     
==========================================
- Hits           99       91       -8     
- Misses         54       61       +7     
+ Partials        1        0       -1     

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