Baikal*: fixed typo in generating ETK interface.ccl

Typo only generated a warning, so it didn't stop compilation
or fail the testsuite.

Tutorial-ETK_thorn-BaikalETK.ipynb

@@ -822,7 +822,7 @@
     "    outstr += \"CCTK_REAL aux_variables type = GF Timelevels=3 TAGS=\\'checkpoint=\\\"no\\\"\\'\\n{\\n\"\n",
     "    outstr += output_list_of_gfs(aux_gfs_list, \"Auxiliary gridfunctions for BSSN diagnostics\")\n",
     "    # Finally, AUXEVOL type:\n",
-    "    outstr += \"CCTK_REAL auxevol_variables type = GF Timelevels=1 TAGS=\\'InterpNumTimelevels=1 prolongation=\\\"none\\\"\\ checkpoint=\\\"no\\\"'\\n{\\n\"\n",
+    "    outstr += \"CCTK_REAL auxevol_variables type = GF Timelevels=1 TAGS=\\'InterpNumTimelevels=1 prolongation=\\\"none\\\" checkpoint=\\\"no\\\"'\\n{\\n\"\n",
     "    outstr += output_list_of_gfs(auxevol_gfs_list, \"Auxiliary gridfunctions needed for evaluating the BSSN RHSs\")\n",
     "\n",
     "    with open(os.path.join(ThornName, \"interface.ccl\"), \"w\") as file:\n",