[FIX] web: width: 100% on .o_field_widget in a group

Restore the old CSS rule:
```css
.o_form_view .o_group .o_field_widget {
    width: 100%;
}
```
Also note that since grid, ´.o_inner_group´ doesn't have the
´o_group´ class anymore.

closes odoo/odoo#102533

X-original-commit: 98dc0b9b9c17354d03714cb51fd3e310f16bef6a
Signed-off-by: Adrien Dieudonné (adr) <adr@odoo.com>

addons/web/static/src/views/fields/many2many_tags/many2many_tags_field.scss

@@ -75,8 +75,12 @@
     }
 }
 
-.o_form_view .o_group .o_field_tags {
-    width: 100%;
+.o_form_view {
+    .o_group, .o_inner_group {
+        .o_field_tags {
+            width: 100%;
+        }
+    }
 }
 
 .o_form_statusbar .o_field_tags {

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

@@ -449,6 +449,12 @@
         }
     }
 
+    .o_group, .o_inner_group {
+        .o_field_widget {
+            width: 100%;
+        }
+    }
+
     .o_checkbox_optional_field {
         display: flex;