Fix import statement in PdfViewer.vue

The import statement for TextLayerBuilder in PdfViewer.vue was incorrect. Fixed the import statement to use the correct path.

streamlit_pdf_viewer/frontend/src/PdfViewer.vue

@@ -27,7 +27,7 @@ import { onMounted, onUpdated, computed, ref} from "vue";
 import "pdfjs-dist/build/pdf.worker.entry";
 import {getDocument} from "pdfjs-dist/build/pdf";
 import {Streamlit} from "streamlit-component-lib";
-import { TextLayerBuilder } from "pdfjs-dist/types/web/text_layer_builder"
+import { TextLayerBuilder } from "pdfjs-dist/web/pdf_viewer"
 
 export default {
   props: ["args"],