Update default configs

[Insprill]

This makes two changes to the default configs:

config.toml:
Switched the client and server sections. These were backward compared to the actual implementation, with all properties being under the client section, and the server section being empty.

SwayOSD/src/config/user.rs

Lines 8 to 20 in bbff4ef

	#[derive(Deserialize, Default, Debug)]
	#[serde(deny_unknown_fields)]
	pub struct ClientConfig {}
	#[derive(Deserialize, Default, Debug, Clone)]
	#[serde(deny_unknown_fields)]
	pub struct ServerConfig {
	pub style: Option<PathBuf>,
	pub top_margin: Option<f32>,
	pub max_volume: Option<u8>,
	pub show_percentage: Option<bool>,
	pub playerctl_format: Option<String>,
	}

Closes #145.

backend.toml:
Added ignore_caps_lock_key with its default value, and a comment inspired by the comment where it's used in code.

[ErikReider]

Thanks! :D