Log the build number, in addition to the version, in the viewer

Given that the `build` number allows you to *directly* find the relevant commit, it cannot hurt to log that one as well.

web/app.js

@@ -1481,7 +1481,7 @@ const PDFViewerApplication = {
     console.log(
       `PDF ${pdfDocument.fingerprints[0]} [${info.PDFFormatVersion} ` +
         `${(info.Producer || "-").trim()} / ${(info.Creator || "-").trim()}] ` +
-        `(PDF.js: ${version || "-"})`
+        `(PDF.js: ${version || "?"} [${build || "?"}])`
     );
     let pdfTitle = info.Title;