Fix #4781: Danbooru Javascript object is broken.

Downgrade Webpack from 5.28.0 to 5.26.3. Breakage was introduced at
5.27.0. It's unclear if this is a regression of issue 12742 in Webpack
or if we're doing something else wrong.

hxxps://github.com-webpack-webpack-issues-12742
hxxps://github.com-webpack-webpack-issues-12851

yarn.lock

@@ -9983,9 +9983,9 @@ fsevents@~2.3.1:
   languageName: node
   linkType: hard
 
-"webpack@npm:^5.11.0":
-  version: 5.28.0
-  resolution: "webpack@npm:5.28.0"
+"webpack@npm:5.26.3":
+  version: 5.26.3
+  resolution: "webpack@npm:5.26.3"
   dependencies:
     "@types/eslint-scope": ^3.7.0
     "@types/estree": ^0.0.46
@@ -10015,7 +10015,7 @@ fsevents@~2.3.1:
       optional: true
   bin:
     webpack: bin/webpack.js
-  checksum: bb1948e6a2039499284f231b1b71e69414e673cd086e55db118f112a18c4a7979c93b607bea4429fc63034babf2b2d21d2f4ba1ee620f1dda614e485848972e3
+  checksum: f3d456173423ba67a18167f79c1c1b3dd33c9e4d2de2c51253fcb148353449235c4b789d22207de34106cfe9efbd20e20fe6a26ba204224ecc34f486a428a3a6
   languageName: node
   linkType: hard