ax(ueps): remove prose inline comments that restate code intent

AX Principle 2: comments must be usage examples, not prose descriptions.
"Corrupt the last byte of the payload/frame" restates what the adjacent
code does rather than demonstrating a call with concrete values.

Co-Authored-By: Charon <charon@lethean.io>

pkg/ueps/packet_test.go

@@ -134,7 +134,6 @@ func TestPacket_MarshalAndSign_Ugly(t *testing.T) {
 		t.Fatalf("MarshalAndSign failed: %v", err)
 	}
 
-	// Corrupt the last byte of the frame (part of the payload)
 	corrupted := make([]byte, len(frame))
 	copy(corrupted, frame)
 	corrupted[len(corrupted)-1] ^= 0xFF

pkg/ueps/reader_test.go

@@ -52,7 +52,6 @@ func TestReader_ReadAndVerify_Bad(t *testing.T) {
 		t.Fatalf("MarshalAndSign failed: %v", err)
 	}
 
-	// Corrupt the last byte of the payload
 	corrupted := make([]byte, len(frame))
 	copy(corrupted, frame)
 	corrupted[len(corrupted)-1] ^= 0xFF