🐛 add missing export for custom-icons to package.json

Author: FabianWilms

package.json

@@ -22,6 +22,7 @@
       "import": "./dist/muc-patternlab-vue.es.js"
     },
     "./dist/assets/temporary/muc-icons.svg": "./dist/assets/temporary/muc-icons.svg",
+    "./dist/assets/temporary/custom-icons.svg": "./dist/assets/temporary/custom-icons.svg",
     "./dist/assets/temporary/muenchende-fontface.css": "./dist/assets/temporary/muenchende-fontface.css",
     "./dist/assets/temporary/muenchende-style.css": "./dist/assets/temporary/muenchende-style.css"
   },