fix(themes): Removed self-dependcy for theme-dark

Author: tgbhy

plugins/theme-dark/package.json

@@ -51,8 +51,5 @@
   },
   "engines": {
     "node": ">=8.17.0"
-  },
-  "dependencies": {
-    "@blockly/theme-dark": "file:"
   }
 }