Refactor <NewExperimentPanel/>

[gdetrez]

• Make erros a Map instead of an object
• Make the name of the scanner id more consistent with the prop name scannerId (scanner -> scannerId in errors and in the callback)
• Add a valid option in the scanner drop down for when scannerId is empty
• Leave sorting the scanners to the selector

[codecov-io]

Codecov Report

Merging #367 into master will decrease coverage by 0.02%. The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #367      +/-   ##
==========================================
- Coverage   40.26%   40.23%   -0.03%     
==========================================
  Files         195      195              
  Lines       16716    16711       -5     
  Branches     2921     2917       -4     
==========================================
- Hits         6730     6724       -6     
- Misses       9571     9572       +1     
  Partials      415      415

Impacted Files	Coverage Δ
.../ui_server_data/js/src/components/ProjectPanel.jsx	66.66% <ø> (ø)	:arrow_up:
scanomatic/ui_server_data/js/src/prop-types.js	100% <ø> (ø)	:arrow_up:
...rver_data/js/src/components/NewExperimentPanel.jsx	100% <100%> (+8%)	:arrow_up:
scanomatic/data_processing/phases/segmentation.py	73.81% <0%> (-0.84%)	:arrow_down:

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