Adds `width: 100%` on the `.o_field_widget` so the input it can take the
all width in the "Quick Create" form.
Also, this commit fixes the CSS selector for the `margin`
rule as in the "Quick Create" form view there is no `.o_group` anymore
on `.o_inner_group`.
Steps to reproduce:
* Go to project
* Select a project
* Click on the `Create` button => BUG
closesodoo/odoo#102151
X-original-commit: 774213758c7ddf7b74a9b370457f017e09d9bbcf
Signed-off-by: Adrien Dieudonné (adr) <adr@odoo.com>
Signed-off-by: Romeo Fragomeli (rfr) <rfr@odoo.com>