Replace the EXIF-block with dummy data to prevent JPEG images being rotated (bug 1942064)

The `ImageDecoder` will respect the EXIF orientation, which can lead to JPEG images being incorrectly rotated. To avoid this we replace the entire EXIF-block with dummy data, which works since it'll cause EXIF parsing to bail out early in Firefox; see https://searchfox.org/mozilla-central/rev/9a66d18cb35595c89f499a1011c9dd7e573fce77/image/decoders/EXIF.cpp#130-138

test/pdfs/.gitignore

@@ -503,6 +503,7 @@
 !annotation-line-without-appearance.pdf
 !bug1669099.pdf
 !annotation-square-circle.pdf
+!bug1942064.pdf
 !annotation-square-circle-without-appearance.pdf
 !annotation-stamp.pdf
 !issue14048.pdf

test/test_manifest.json

@@ -8997,6 +8997,13 @@
     "link": true,
     "type": "other"
   },
+  {
+    "id": "bug1942064",
+    "file": "pdfs/bug1942064.pdf",
+    "md5": "d50b5ebb8cab1211609d16faa54ec47d",
+    "rounds": 1,
+    "type": "eq"
+  },
   {
     "id": "issue16221-text",
     "file": "pdfs/issue16221.pdf",