fix(mf6): defensive devtools compatibility fix (#2762)

Compatibility fix anticipating some minor changes in devtools. Comment header lines will soon be returned verbatim, without stripping the leading "# [flopy] [mf6]".

Author: wpbonelli

flopy/mf6/utils/codegen/filters.py

@@ -363,6 +363,7 @@ def _filter_metadata(metadata):
 
     legacy_dfn = dfn.get("legacy_dfn", {})
     legacy_meta = dfn.get("legacy_meta", [])
+    legacy_meta = [s.replace("#", "").replace("flopy", "").replace("mf6", "").strip() for s in legacy_meta]
     legacy_dfn = _dfn(legacy_dfn, _filter_metadata(legacy_meta))
     if component_base == "MFPackage":
         attrs.extend(