EXT-7884 (\"Set Default Upload Permissions\" may make more sense in the Upload sub-menu)

- In viewer menu 'Set Default Upload Permissions' menu item was moved from 'Options' menu to the 'Upload' menu.
- 'Set Default Upload Permissions' menu item was added to the inventory menu.
- Removed stray separators.

Reviewed by Vadim Savchuk at https://codereview.productengine.com/secondlife/r/734/

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branch : product-engine