[FIX] web: quick create inputs don't take all space

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

closes odoo/odoo#102151

X-original-commit: 774213758c7ddf7b74a9b370457f017e09d9bbcf
Signed-off-by: Adrien Dieudonné (adr) <adr@odoo.com>
Signed-off-by: Romeo Fragomeli (rfr) <rfr@odoo.com>

addons/web/static/src/views/form/form_controller.scss

@@ -42,6 +42,7 @@
             }
 
             .o_field_widget {
+                width: 100%;
                 margin-bottom: $o-form-spacing-unit * 2;
 
                 > .o_field_widget {
@@ -397,8 +398,6 @@
         }
 
         .o_field_widget {
-            width: 100%;
-
             > .btn {
                 flex: 0 0 auto;
                 padding: 0 10px;

addons/web/static/src/views/kanban/kanban_controller.scss

@@ -45,7 +45,7 @@
         margin-top: calc(var(--KanbanRecord-margin-h) * 2);
         padding: 8px;
 
-        .o_form_view .o_group.o_inner_group {
+        .o_form_view .o_inner_group {
             margin: 0;
         }
     }