make usePdfJs non-optional

Author: edsilv

src/content-handlers/iiif/extensions/uv-pdf-extension/config/Config.ts

@@ -15,7 +15,7 @@ import {
 
 type PDFCenterPanelOptions = CenterPanelOptions & {
   /** Determines if PDF.js should be used for PDF rendering */
-  usePdfJs?: boolean;
+  usePdfJs: boolean;
 };
 
 type PDFCenterPanelContent = CenterPanelContent & {};

src/content-handlers/iiif/extensions/uv-pdf-extension/config/config.json

@@ -43,7 +43,6 @@
     "theme": "uv-en-GB-theme",
     "tokenStorage": "session",
     "useArrowKeysToNavigate": false,
-    "usePdfJs": true,
     "zoomToSearchResultEnabled": true
   },
   "modules": {
@@ -180,7 +179,8 @@
         "titleEnabled": false,
         "subtitleEnabled": true,
         "mostSpecificRequiredStatement": true,
-        "requiredStatementEnabled": true
+        "requiredStatementEnabled": true,
+        "usePdfJs": true
       },
       "content": {
         "attribution": "$attribution"