Deleted the view of lease in editing file page.
I didn't find the spec/view file for '_form_permission.html.erb', so I just added a feature spec of it.
Coverage remained the same at 95.872% when pulling 94c7ff3161658cff53be9e1109f3564e21c908f1 on bug/#1912-Lease-option-available-when-editing-file-set-permissions into 92c32ac287c2f408925e500cee6b7751bb3144b7 on develop.
Fixes #1912
Deleted the view of lease in editing file page. I didn't find the spec/view file for '_form_permission.html.erb', so I just added a feature spec of it.