Fix gui reencryption need offline handling

[touilleMan]

fix #970

[codecov]

Codecov Report

Merging #1016 into master will increase coverage by 12.52%.
The diff coverage is 55.55%.

@@             Coverage Diff             @@
##           master    #1016       +/-   ##
===========================================
+ Coverage   67.55%   80.07%   +12.52%     
===========================================
  Files         221      263       +42     
  Lines       17182    21661     +4479     
===========================================
+ Hits        11607    17345     +5738     
+ Misses       5575     4316     -1259     

Impacted Files	Coverage Δ
parsec/monitoring.py	51.42% <0.00%> (-11.43%)	⬇️
parsec/core/gui/ui/changelog_widget.py	22.22% <0.00%> (ø)
parsec/core/gui/ui/main_window.py	100.00% <0.00%> (ø)
parsec/core/gui/ui/central_widget.py	100.00% <0.00%> (ø)
parsec/core/gui/ui/notification_center_widget.py	100.00% <0.00%> (ø)
parsec/core/gui/ui/question_dialog.py	100.00% <0.00%> (ø)
parsec/core/gui/ui/device_button.py	100.00% <0.00%> (ø)
parsec/core/gui/ui/workspace_sharing_dialog.py	3.37% <0.00%> (ø)
parsec/core/gui/ui/new_version_available.py	7.69% <0.00%> (ø)
parsec/core/gui/ui/password_change_dialog.py	100.00% <0.00%> (ø)
... and 87 more

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