I18n: Fix regex for messages from BKE_modifier_set_error.

Signature of this function changed at some point, regex to extract
messages from it was no longer working.

Reported/detected as part of D15418.

release/scripts/modules/bl_i18n_utils/settings.py

@@ -248,7 +248,7 @@ PYGETTEXT_KEYWORDS = (() +
     tuple(("{}\\((?:[^\"',]+,){{3}}\\s*" + _msg_re + r"\s*\)").format(it)
           for it in ("BMO_error_raise",)) +
 
-    tuple(("{}\\((?:[^\"',]+,)\\s*" + _msg_re + r"\s*(?:\)|,)").format(it)
+    tuple(("{}\\((?:[^\"',]+,){{2}}\\s*" + _msg_re + r"\s*(?:\)|,)").format(it)
           for it in ("BKE_modifier_set_error",)) +
 
     # bUnitDef unit names.