fix: split video args

[lxShaDoWxl]

if usage
cm selenoid start --vnc --tmpfs 128 --args "-video-recorder-image docker.io/selenoid/video-recorder:7.1"
to arg video-recorder-image dublicate need usage
cm selenoid start --vnc --tmpfs 128 --args "-video-recorder-image docker.io/selenoid/video-recorder:7.1 -video-output-dir /opt/selenoid/video/"
this incorrect work

[codecov]

Codecov Report

Merging #289 (b3c4fb1) into master (a491e7c) will increase coverage by 0.06%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #289      +/-   ##
==========================================
+ Coverage   67.69%   67.75%   +0.06%     
==========================================
  Files           4        4              
  Lines        1040     1042       +2     
==========================================
+ Hits          704      706       +2     
  Misses        229      229              
  Partials      107      107              

Flag	Coverage Δ
go	67.75% <100.00%> (+0.06%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
selenoid/docker.go	73.53% <100.00%> (+0.10%)	⬆️

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[vania-pooh]

@lxShaDoWxl thank you for contribution!