refactor: simplify several small code patterns

- Drop the UMASK variable; umask is called directly with the literal value
- Simplify filesize() to a one-liner using || instead of if/local/printf
- Fold token lowercasing into the local declaration in add_skip_codec_token
  and drop the now-redundant empty-string guard
- Replace manual whitespace trimming in the skip.conf reader with read's
  built-in IFS trimming
- Replace the yuvj* case statement with a single parameter substitution
- Collapse nested only-if-smaller conditions into one && expression
- Move the "Sourcing preset file" debug call to just before source

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