Export Dialog: Avoid appending the wrong extension

If the current file extension does not match the first entry
in the "filter" section of the file dialog, the first extension
is erroneosuly appended to the file name.

Moving "All Files ( * )" in front as first entry avoids this.

widgets/ExportDialog.cpp

@@ -45,7 +45,7 @@ ExportDialog::ExportDialog(QWidget *w, const QString &title,
 		fname + "." + types[0]->extension;
 	filename->setText(nativeSeparator(fn));
 
-	filter = filt + ";;" + tr("All files ( * )");
+	filter = tr("All files ( * )") + ";;" + filt;
 
 	foreach(const pki_export *t, types) {
 		if (t->flags & F_USUAL)