Do not list new translation template as translation

Signed-off-by: Michal Čihař <michal@cihar.com>

weblate/trans/models/subproject.py

@@ -895,6 +895,8 @@ class SubProject(models.Model, PercentMixin, URLMixin, PathMixin):
                 matches.add(self.template)
             else:
                 matches.discard(self.template)
+        if self.new_base and self.new_base != self.template:
+            matches.discard(self.new_base)
         return sorted(matches)
 
     def create_translations(self, force=False, langs=None, request=None):