fix(LAB-3996): update FakeFFmpegVideoSplitter to accept new kili-formats kwargs

Author: paulruelle

tests/unit/services/export/fakes/fake_ffmpeg.py

@@ -43,7 +43,7 @@ def filter(self, filter_name, fps, round):
         self.round = round
         return self
 
-    def output(self, output_path_pattern, start_number):
+    def output(self, output_path_pattern, start_number, **kwargs):
         self.output_path_pattern = output_path_pattern
         self.start_number = start_number
         return self