Use different aboutdata for signed AppImage

This was previously only patched when the Gpg4win based
Kleopatra AppImage was built. The patch accidentally
orverwrote the version info so it is cleaner to commit
this.

src/aboutdata.cpp

@@ -85,6 +85,14 @@ AboutData::AboutData()
                   QLatin1String(credits[i].email), QLatin1String(credits[i].web));
     }
 
+    /* For Linux it is possible that kleo is shipped as part
+     * of a Gpg4win based Appimage with according about data. */
+    if (Kleo::gpg4winSignedversion()) {
+        setVersion(Kleo::gpg4winVersion().toUtf8());
+        setShortDescription(Kleo::gpg4winDescription());
+        setOtherText(Kleo::gpg4winLongDescription());
+        setBugAddress("https://dev.gnupg.org/u/rgpg4win");
+    }
 
     const auto backendVersions = Kleo::backendVersionInfo();
     if (!backendVersions.empty()) {