39921: __git_recent_branches: Remove erroneous parsing of partial ref names as tags.

In the reflog, partial ref names in the "from" field always represent names of
heads.  (That is not true for the "to" field.)  The parsing of tag names was
added in commit 39102 (317c96b64f43688a6be08a8b1c93b6ab4eed662c) for equivalence
with the then-previous implementation which used `git log $partial_ref_name`.
The equivalence was correct, however, the then-previous implementation was not,
since it would consider $partial_ref_name as a refs/tags/ name if a refs/heads/
name did not exist.

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