Ensure preservation of " if rename fails

If ent would swallow a ", make sure to put it back.

confluent_osdeploy/el9-diskless/profiles/default/scripts/image2disk.py

@@ -206,6 +206,8 @@ def fixup(rootdir, vols):
                     ent = convert_lv(ent)
                     if ent:
                         newline.append(ent)
+                    elif '""' in ent:
+                        newline.append('""')
                 else:
                     newline.append(ent)
             defgrubout.write(' '.join(newline) + '\n')