Fix clone dialog doesn't pick up destination

[mstv]

Fixes #5590

Changes proposed in this pull request:

• use the clone command's argument as destination folder unless it describes a repo

Screenshots before and after (if PR changes UI):

• N/A

What did I do to test the code and ensure quality:

• manual testing

Has been tested on (remove any that don't apply):

• Windows 7

[codecov]

Codecov Report

Merging #5803 into master will increase coverage by 0.01%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master    #5803      +/-   ##
==========================================
+ Coverage   36.94%   36.95%   +0.01%     
==========================================
  Files         620      620              
  Lines       47416    47418       +2     
  Branches     6323     6324       +1     
==========================================
+ Hits        17518    17524       +6     
+ Misses      29115    29113       -2     
+ Partials      783      781       -2

[gerhardol]

tested

[RussKie]

Thank you