Allow to use --print with full review request URL

Review Request #11381 — Created Jan. 14, 2021 and updated

misery
RBTools
release-2.0.x
rbtools
rbt 2.0 introduced the possibility to provide the
review request number as full URL. But this wasn't
possible for --print option.

  rbt patch --print https://reviewboard/r/12345
  ERROR: Unable to find a Review Board server for this source code tree.

This change allows the usage, too.

Tried rbt patch --print https://reviewboard/r/12345 after fix
and saw that is printed the diff to stdout.

Tried rbt patch --print 12345 without repository and saw
that the error from above.

Summary
Allow to use --print with full review request URL
Checks run (2 succeeded)
flake8 passed.
JSHint passed.
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