XFA - Match font family correctly

- partial fix for https://bugzilla.mozilla.org/show_bug.cgi?id=1716980;
  - some pdf can contain an invalid font family (e.g. 'Windings 3') so in this case remove the space;
  - the font family in typeface attribute doesn't always match the one defined in the FontDescriptor dictionary.

test/pdfs/xfa_bug1716980.pdf.link

@@ -0,0 +1 @@
+https://bugzilla.mozilla.org/attachment.cgi?id=9227656

test/test_manifest.json

@@ -938,6 +938,14 @@
        "enableXfa": true,
        "type": "eq"
     },
+    {  "id": "xfa_bug1716980",
+       "file": "pdfs/xfa_bug1716980.pdf",
+       "md5": "3d7598b9548d78f209d013c485162e9a",
+       "link": true,
+       "rounds": 1,
+       "enableXfa": true,
+       "type": "eq"
+    },
     {  "id": "xfa_bug1716809",
        "file": "pdfs/xfa_bug1716809.pdf",
        "md5": "7192f9e27e8b84776d107f57cbe353d5",

test/unit/xfa_tohtml_spec.js

@@ -73,6 +73,7 @@ describe("XFAFactory", function () {
 </xdp:xdp>
       `;
       const factory = new XFAFactory({ "xdp:xdp": xml });
+      factory.setFonts([]);
 
       expect(factory.numberPages).toEqual(2);
 
@@ -116,7 +117,7 @@ describe("XFAFactory", function () {
       ]);
       expect(draw.attributes.style).toEqual({
         color: "#0c1722",
-        fontFamily: '"FooBar","FooBar-PdfJS-XFA"',
+        fontFamily: '"FooBar"',
         fontSize: "6.93px",
         margin: "1px 4px 2px 3px",
         verticalAlign: "2px",