Fix missing lit-element dependency

node-resolve wasn't limited to the local node_modules and picked up the
dependency from another package on my machine.

packages/common/package.json

@@ -24,6 +24,7 @@
     "test": "npm run build-test && karma start --singleRun"
   },
   "dependencies": {
-    "i18next": "^17.0.9"
+    "i18next": "^17.0.9",
+    "lit-element": "^2.2.1"
   }
 }

packages/common/rollup.config.js

+import path from 'path';
 import resolve from 'rollup-plugin-node-resolve';
 import commonjs from 'rollup-plugin-commonjs';
 import replace from "rollup-plugin-replace";
@@ -14,7 +15,12 @@ export default {
     },
     plugins: [
         multiEntry(),
-        resolve(),
+        resolve({
+          customResolveOptions: {
+            // ignore node_modules from vendored packages
+            moduleDirectory: path.join(process.cwd(), 'node_modules')
+          }
+        }),
         commonjs({
             include: 'node_modules/**'
         }),