Fix: avoid hotkeys in contenteditable

[janepie]

fixes nextcloud/assistant#16

NcRichContenteditable uses a div for text input so shortkeys defined via vue-shortkey do not get avoided unless they are explicitly excluded

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 22.97%. Comparing base (354109b) to head (cad954e).
Report is 53 commits behind head on main.

Files with missing lines	Patch %	Lines
src/main.js	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##               main    #6639   +/-   ##
=========================================
  Coverage     22.97%   22.97%           
  Complexity      475      475           
=========================================
  Files           252      252           
  Lines         12128    12128           
  Branches       2317     2317           
=========================================
  Hits           2786     2786           
  Misses         9015     9015           
  Partials        327      327           

Flag	Coverage Δ
javascript	14.51% <0.00%> (ø)
php	59.30% <ø> (ø)

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[st3iny]

Looks good, thanks.

[st3iny]

/backport to stable5.0

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