bookmarks: ensure current bookmark is updated when specified with -r .

"hg bookmark -r . foo" should be equivalent to "hg bookmark foo".

hgext/bookmarks.py

@@ -146,7 +146,7 b' def bookmark(ui, repo, mark=None, rev=No'
             marks[mark] = repo.lookup(rev)
         else:
             marks[mark] = repo.changectx('.').node()
-            setcurrent(repo, mark)
+        setcurrent(repo, mark)
         write(repo)
         return
 

tests/test-bookmarks-current

@@ -57,3 +57,8 b' hg bookmark'
 echo % update to tip
 hg update tip
 
+echo % set bookmark Y using -r .
+hg bookmark -r . Y
+
+echo % list bookmarks
+hg bookmark

tests/test-bookmarks-current.out

@@ -25,3 +25,6 b' 0 files updated, 0 files merged, 0 files'
 no bookmarks set
 % update to tip
 0 files updated, 0 files merged, 0 files removed, 0 files unresolved
+% set bookmark Y using -r .
+% list bookmarks
+ * Y                         0:719295282060