diffoscope: Fix the OpenPGP test which broke with pgpdump 0.34

This fixes a regression from the last pgpdump update: 816d311bd0
See https://github.com/NixOS/nixpkgs/pull/149700#issuecomment-991592708

Reported-by: Sergei Trofimovich <slyich@gmail.com>

pkgs/tools/misc/diffoscope/fix-tests.patch

@@ -12,3 +12,22 @@ index 8d201ab..05960aa 100644
      return get_data(diff_file)
  
  
+diff --git a/tests/data/pgp_signed_expected_diff b/tests/data/pgp_signed_expected_diff
+index 7e90e428..9628efa0 100644
+--- a/tests/data/pgp_signed_expected_diff
++++ b/tests/data/pgp_signed_expected_diff
+@@ -5,11 +5,11 @@
+  	Key ID - 0x1E953E27D4311E58
+  	Next packet - other than one pass signature
+  Old: Literal Data Packet(tag 11)(10255 bytes)
+- 	Format - binary
++ 	Packet data format - binary
+ -	Filename - test1.tar
+--	File modified time - Tue Aug 25 11:47:35 UTC 2020
++-	Creation time - Tue Aug 25 11:47:35 UTC 2020
+ +	Filename - test2.tar
+-+	File modified time - Tue Aug 25 11:47:38 UTC 2020
+++	Creation time - Tue Aug 25 11:47:38 UTC 2020
+  	Literal - ...
+  Old: Signature Packet(tag 2)(563 bytes)
+  	Ver 4 - new