fix: scp bug when copying /

[caarlos0]

if you had your root folder to /foo/bar, and ran scp host:/ /tmp/, it would create a /tmp/bar folder, which it shouldn't.

[codecov-commenter]

Codecov Report

Merging #104 (d919714) into main (d501f49) will increase coverage by 0.14%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #104      +/-   ##
==========================================
+ Coverage   72.50%   72.65%   +0.14%     
==========================================
  Files          18       18              
  Lines         913      918       +5     
==========================================
+ Hits          662      667       +5     
  Misses        197      197              
  Partials       54       54              

Impacted Files	Coverage Δ
scp/filesystem.go	90.32% <100.00%> (+0.54%)	⬆️

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