Revert "Allow branch.*.merge to talk about remote tracking branches."

This reverts commit 80c7977.

Back when I committed this, it seemed to be a good idea.  People
who always use remote tracking branches can optionally use the
local name they happen to use to specify what to merge, which meant
that I did not have to teach them why we use the name at the remote
side every time they are confused.

But allowing it seems to break other people's scripts.  The real
solution is not to allow more ways to express the same thing, but
to educate people to use the right syntax.

Signed-off-by: Junio C Hamano <junkio@cox.net>

git-parse-remote.sh

@@ -174,12 +174,8 @@ canon_refs_list_for_fetch () {
 		else
 			for merge_branch in $merge_branches
 			do
-			    if	test "$remote" = "$merge_branch" ||
-				test "$local" = "$merge_branch"
-			    then
-				    dot_prefix=
-				    break
-			    fi
+			    [ "$remote" = "$merge_branch" ] &&
+			    dot_prefix= && break
 			done
 		fi
 		case "$remote" in