Remove unnecessary authorize_user! filter [can be updated]

Created by: cirosantilli

from Project controllers. The filter is already implied by ApplicationController#project which is used as a before_filter.

Faster because one less helper, less redundant code.

It is implied because:

• authorization is skipped iff user can read_project, which is checked in def project
• other cases lead to either authorize_user! or 404 as expected
• the project filter is not skipped in any project controller