[HOTFIX] Fix StringFormattingException regarding keep_max_files (#1427)

Closes this issue from last release: #1426

Author: jmbannon

src/ytdl_sub/subscriptions/subscription_download.py

@@ -155,8 +155,8 @@ def _maintain_archive_file(self):
             keep_max_files: Optional[int] = None
             if self.output_options.keep_max_files:
                 # validated it can be cast to int within the validator
-                keep_max_files = int(
-                    self.overrides.apply_formatter(self.output_options.keep_max_files)
+                keep_max_files = self.overrides.apply_formatter(
+                    self.output_options.keep_max_files, expected_type=int
                 )
 
             if date_range_to_keep or self.output_options.keep_max_files is not None:

src/ytdl_sub/subscriptions/subscription_ytdl_options.py

@@ -94,8 +94,8 @@ def _output_options(self) -> Dict:
                 self._enhanced_download_archive.working_ytdl_file_path
             )
         if self._preset.output_options.keep_max_files:
-            keep_max_files = int(
-                self._overrides.apply_formatter(self._preset.output_options.keep_max_files)
+            keep_max_files = self._overrides.apply_formatter(
+                self._preset.output_options.keep_max_files, expected_type=int
             )
             if keep_max_files > 0:
                 # yt-dlp has a weird bug with max_downloads=1, set to 2 for safe measure