[users] Rename a misleading JS file name.

static/js/hatohol_priviledge_selector.js ->
static/js/hatohol_priviledge_edit_dialog.js
[client] Rename a misleading object name.

HatoholPriviledgeSelector ->
HatoholPriviledgeEditDialog
[client][HatoholPriviledgeEditDialog] Inherit HatoholDialog directly instead of HatoholSelector
[client][HatoholPriviledgeEditDialog] Fix some misleading element ID.