[IMP] web: remove unused rules for .o_field_color_picker_preview

Part-of: odoo/odoo#129983

addons/web/static/src/legacy/scss/color_picker.scss

@@ -23,42 +23,3 @@
         }
     }
 }
-
-.o_field_color_picker_preview {
-    @include o-kanban-record-color;
-    margin-right: 7px;
-    > li {
-        display: inline-block;
-        margin: $o-kanban-inner-hmargin $o-kanban-inner-hmargin 0 0;
-        border: 1px solid white;
-        box-shadow: 0 0 0 1px map-get($grays, '300');
-
-        > a {
-            display: block;
-
-            &::after {
-                content: "";
-                display: block;
-                width: 20px;
-                height: 15px;
-            }
-        }
-
-        // No Color
-        a.oe_kanban_color_0 {
-            position: relative;
-            &::before {
-                content: "";
-                @include o-position-absolute(-2px, $left: 10px);
-                display: block;
-                width: 1px;
-                height: 20px;
-                transform: rotate(45deg);
-                background-color: red;
-            }
-            &::after {
-                background-color: white;
-            }
-        }
-    }
-}

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

@@ -133,7 +133,7 @@
             }
         }
 
-        .o_quick_editable:not(.o_form_uri), .o_field_color_picker_preview > li > a {
+        .o_quick_editable:not(.o_form_uri) {
             cursor: default;
         }
     }