fix(top-app-bar): update elevation import paths to use relative references

Author: zZHorizonZz

topappbar/internal/_shared.scss

@@ -1,5 +1,5 @@
 @use 'sass:map';
-@use "@material/web/elevation/elevation";
+@use "../../elevation/elevation";
 
 @mixin styles() {
   :host {

topappbar/internal/expanded-top-app-bar.ts

@@ -1,4 +1,4 @@
-import '@material/web/elevation/elevation.js';
+import '../../elevation.js';
 import {html, LitElement} from 'lit';
 import {property} from 'lit/decorators/property.js';
 

topappbar/internal/top-app-bar.ts

@@ -1,4 +1,4 @@
-import '@material/web/elevation/elevation.js';
+import '../../elevation/elevation.js';
 import {html, LitElement} from 'lit';
 import {property} from 'lit/decorators/property.js';