[REV] tools: partially revert 0ec6acc4

No justification, commit message not linked to the diff.
If there is an issue in the line_number extraction it must be
investigated.
I suspect an outdated polib version.

closes odoo/odoo#40672

Signed-off-by: Martin Trigaux (mat) <mat@odoo.com>

odoo/tools/translate.py

@@ -632,7 +632,7 @@ class PoFileReader:
                         'src': source,
                         'value': translation,
                         'comments': comments,
-                        'res_id': int(line_number or 0),
+                        'res_id': int(line_number),
                         'module': module,
                     }
                     continue