common: Fix a dependency cycle

Importing the module itself adds a dependency on teh index which creates a cycle.
Reference the internal file instead.

packages/common/src/adapter-lit-element.js

 import {LitElement} from "lit-element";
-import {Logger} from "@dbp-toolkit/common";
+import {Logger} from "./logger";
 
 export class AdapterLitElement extends LitElement {
     constructor() {