fix crane's root.go after DefaultTransport change

[imjasonh]

#1449 changed remote.DefaultTransport to be a http.RoundTripper instead of a *http.Transport, and made a corresponding change in crane to call Clone only if the provided RoundTripper was also cloneable. It was overly clever, and unnecessary, and seems to have broken crane's insecure repo support.

[codecov-commenter]

Codecov Report

Merging #1450 (18c1e41) into main (f981b4c) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #1450   +/-   ##
=======================================
  Coverage   73.31%   73.31%           
=======================================
  Files         115      115           
  Lines        8772     8772           
=======================================
  Hits         6431     6431           
  Misses       1696     1696           
  Partials      645      645           

Impacted Files	Coverage Δ
pkg/v1/remote/options.go	71.81% <ø> (ø)

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