This commit contains a few small improvements to the Expense app.
- "View Report" button moved to the left if an attachment has been uploaded.
- Reports are auto saved when created from an expense.
- "Attach Receipt" button now sets the uploaded attachment as the main attachment.
- Expense lines in a report are no longer editable. When a line is clicked, the main attachment for that expense (if any) is shown in the attachment previewer.
task-3539382
closesodoo/odoo#138387
Related: odoo/enterprise#50136
Signed-off-by: Habib Ayob (ayh) <ayh@odoo.com>