Merge branch 'jk/proto-v2-ref-prefix-fix'

"git ls-remote $there foo" was broken by recent update for the
protocol v2 and stopped showing refs that match 'foo' that are not
refs/{heads,tags}/foo, which has been fixed.

* jk/proto-v2-ref-prefix-fix:
ls-remote: pass heads/tags prefixes to transport
ls-remote: do not send ref prefixes for patterns

diff --cc builtin/ls-remote.c
Simple merge

diff --cc t/t5512-ls-remote.sh
Simple merge