backout: pass 'editform' argument to 'cmdutil.getcommiteditor'
This patch passes 'editform' argument according to the format below:
COMMAND[.ROUTE]
- ROUTE: name of route, if there are two or more routes in COMMAND
In this patch, ROUTE is omitted..
http://example.com/no/anchor, branches: (None, [])
http://example.com/an/anchor, branches: ('foo', [])
http://example.com/no/anchor/branches, branches: (None, ['foo'])
http://example.com/an/anchor/branches, branches: ('bar', ['foo'])
http://example.com/an/anchor/branches-None, branches: ('foo', [])
http://example.com/, branches: (None, [])
http://example.com/, branches: (None, [])
http://example.com/, branches: ('foo', [])