fix(cli): proper defaults for dump

[Tieske]

fixes this error; Error: output-file cannot be specified with --all-workspace flag

when using deck dump --all-workspaces.

[codecov-commenter]

Codecov Report

Attention: 12 lines in your changes are missing coverage. Please review.

Comparison is base (b3ccdd5) 32.87% compared to head (0b26837) 32.87%.
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1094   +/-   ##
=======================================
  Coverage   32.87%   32.87%           
=======================================
  Files         103      103           
  Lines       12850    12847    -3     
=======================================
  Hits         4224     4224           
+ Misses       8217     8214    -3     
  Partials      409      409           

Files	Coverage Δ
cmd/gateway_dump.go	0.00% <0.00%> (ø)

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