fix keep_files_after error in partial validate

examples/tv_show_config.yaml

@@ -77,7 +77,6 @@ presets:
     # "season_by_year__episode_by_download_index" if you plan to delete older videos
     output_options:
       keep_files_after: "today-{download_range}"
-      maintain_download_archive: True
 
     # Set the duration of download_range, defaults to 2 months
     overrides:

src/ytdl_sub/config/preset_options.py

@@ -191,6 +191,8 @@ class OutputOptions(StrictDictValidator):
         if isinstance(value, dict):
             value["output_directory"] = value.get("output_directory", "placeholder")
             value["file_name"] = value.get("file_name", "placeholder")
+            # Set this to True by default in partial validate to avoid failing from keep_files
+            value["maintain_download_archive"] = value.get("maintain_download_archive", True)
         _ = cls(name, value)
 
     def __init__(self, name, value):

tests/unit/config/test_config_file.py

@@ -37,7 +37,7 @@ class TestConfigFilePartiallyValidatesPresets:
             {"nfo_tags": {"tags": {"key-1": "preset_0"}}},
             {"output_directory_nfo_tags": {"nfo_root": "test"}},
             {"output_options": {"file_name": "test"}},
-            {"output_options": {"keep_files_after": "today", "maintain_download_archive": True}},
+            {"output_options": {"keep_files_after": "today"}},
             {"ytdl_options": {"format": "best"}},
             {"overrides": {"a": "b"}},
         ],