`td wf` command should support "-e https://api.treasuredata.co.jp/" as same as `td` command

[kamikaseda]

When user initialize td toolbelt by td -e https://api.treasuredata.co.jp/ -f account, td toolbelt can work normally.
However, td wf command can not work with the above setting.

C:\Users\U0377864>td wf
TreasureData account is not configured yet.
Run 'td account' first.

Cause

The cause is / of the end of endpoint.
To initialize by td -e https://api.treasuredata.co.jp/ -f account, td wf can work normally.

Goal of ticket

td wf should support the format of https://api.treasuredata.co.jp/ because td command itself supports.