Misc issues

[SJuliez]

• properly dispose the map editor boardview so it doesnt receive events later
• in the lobby's board preview, react directly to the deployment zone checkbox and remove the "update" button
• minor changes (removing unused code etc)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 29.19%. Comparing base (c69bfa8) to head (179fdea).
Report is 49 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #6154      +/-   ##
============================================
+ Coverage     29.07%   29.19%   +0.11%     
- Complexity    13972    13975       +3     
============================================
  Files          2601     2623      +22     
  Lines        267448   266397    -1051     
  Branches      47747    47583     -164     
============================================
+ Hits          77769    77776       +7     
+ Misses       185776   184716    -1060     
- Partials       3903     3905       +2     

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