[FIX] base: join correctly the path

os.path.join(..., <absolute>) returns <absolute> path

closes odoo/odoo#142307

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

odoo/addons/base/models/ir_module.py

@@ -162,7 +162,7 @@ class Module(models.Model):
             if not module.name:
                 module.description_html = False
                 continue
-            path = os.path.join(module.name, '/static/description/index.html')
+            path = os.path.join(module.name, 'static/description/index.html')
             try:
                 with tools.file_open(path, 'rb') as desc_file:
                     doc = desc_file.read()