Do not update shapes on property::size

[DziubanMaciej]

The internal::update_shapes signal will be emitted by client_refresh which does it. Also, delay it until next frame. For some reason updating shapes directly within client_refresh introduces some flicker

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.47%. Comparing base (f1388f9) to head (f7a98ce).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4093      +/-   ##
==========================================
+ Coverage   90.45%   90.47%   +0.01%     
==========================================
  Files         941      941              
  Lines       60390    60394       +4     
  Branches     1145     1145              
==========================================
+ Hits        54628    54640      +12     
+ Misses       5252     5247       -5     
+ Partials      510      507       -3     

Files with missing lines	Coverage Δ
lib/awful/client/shape.lua	100.00% <100.00%> (ø)

... and 5 files with indirect coverage changes

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