Reduce the scope of some flags

[marcospb19]

Flags like --hidden and --gitignore are set in the Opts struct,
however, they are specific to the compress subcommand, so these
flags should be moved to the Subcommand::Compress enum variant.

ouch/src/opts.rs

Lines 28 to 34 in 5a97029

	/// Ignores hidden files
	#[arg(short = 'H', long)]
	pub hidden: bool,
	/// Ignores files matched by git's ignore files
	#[arg(short = 'g', long)]
	pub gitignore: bool,

This will hide those flags when using Ouch with other commands.