markersize fix, take 2

[pablosanjose]

Following a suggestion by @SimonDanish in MakieOrg/Makie.jl#3307, we use marker = Circle in scatter!, which should fix the performance issue even for non-scalar markersize

[pablosanjose]

Again, when MakieOrg/Makie.jl#3281 lands, we could remove this fix, although it is not clear to me if there is any advantage in not using marker = Circle.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (4712038) 92.54% compared to head (7f0946c) 92.54%.
Report is 1 commits behind head on master.

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Additional details and impacted files

@@           Coverage Diff           @@
##           master     #218   +/-   ##
=======================================
  Coverage   92.54%   92.54%           
=======================================
  Files          34       34           
  Lines        5443     5443           
=======================================
  Hits         5037     5037           
  Misses        406      406           

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