fix(exporters): honor strings filter for MO files

While the blank strings are probably not useful for using as MO files,
the fuzzy strings might be and the filter is in place to allow users
filter strings they want.

Fixes #11656

weblate/formats/exporters.py

@@ -360,9 +360,6 @@ def store_flags(self, output, flags) -> None:
         return
 
     def add_unit(self, unit) -> None:
-        # We do not store untranslated units
-        if not unit.translated:
-            return
         # Parse properties from unit
         if self.monolingual:
             if self.use_context: