Set select2 width to 100% so they adapt when browser window is resized

With that style, all formset rows were a fix pixels less wide than surrounding content

src/pretix/static/pretixcontrol/js/ui/checkinrules.js

@@ -275,35 +275,6 @@ $(function () {
           _update();
         })
         _update()
-
-        function check_for_invalid_ids(valid_products, valid_variations, rule) {
-          if (rule["and"]) {
-            for(const child of rule["and"])
-              check_for_invalid_ids(valid_products, valid_variations, child);
-          } else if (rule["or"]) {
-            for(const child of rule["or"])
-              check_for_invalid_ids(valid_products, valid_variations, child);
-          } else if (rule["inList"] && rule["inList"][0]["var"] === "product") {
-            for(const item of rule["inList"][1]["objectList"]) {
-              if (!valid_products[item["lookup"][1]])
-                item["lookup"][2] = "[" + gettext('Error: Product not found!') + "]";
-              else
-                item["lookup"][2] = valid_products[item["lookup"][1]];
-            }
-          } else if (rule["inList"] && rule["inList"][0]["var"] === "variation") {
-            for(const item of rule["inList"][1]["objectList"]) {
-              if (!valid_variations[item["lookup"][1]])
-                item["lookup"][2] = "[" + gettext('Error: Variation not found!') + "]";
-              else
-                item["lookup"][2] = valid_variations[item["lookup"][1]];
-            }
-          }
-        }
-        check_for_invalid_ids(
-            Object.fromEntries(this.items.map(p => [p.id, p.name])),
-            Object.fromEntries(this.items.flatMap(p => p.variations?.map(v => [v.id, p.name + ' – ' + v.name]))),
-            this.rules
-        );
       }
     },
     watch: {