style: change to arrows expand icon, aimd to close #421

[dfguerrerom]

just changing to arrows expand icon

[12rambau]

I don't see any issue from my side.

Note that the "expand" "compress" icons are currently used by facebook videos so we were not that far away from the tree ;-)

[codecov]

Codecov Report

Merging #440 (aedb731) into master (2f96371) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #440   +/-   ##
=======================================
  Coverage   87.20%   87.20%           
=======================================
  Files          24       24           
  Lines        2869     2869           
=======================================
  Hits         2502     2502           
  Misses        367      367           

Impacted Files	Coverage Δ
sepal_ui/mapping/fullscreen_control.py	100.00% <100.00%> (ø)

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