Fix missing hyphen values parsing clap commands definition (#193)

Author: busybox11

src/args.rs

@@ -58,11 +58,19 @@ pub struct ArgsClient {
 	pub scroll_lock_led: Option<String>,
 
 	/// Shows volume osd and raises, loweres or mutes default sink volume
-	#[arg(long, value_name = "raise|lower|mute-toggle|(±)number")]
+	#[arg(
+		long,
+		value_name = "raise|lower|mute-toggle|(±)number",
+		allow_negative_numbers = true
+	)]
 	pub output_volume: Option<String>,
 
 	/// Shows volume osd and raises, loweres or mutes default source volume
-	#[arg(long, value_name = "raise|lower|mute-toggle|(±)number")]
+	#[arg(
+		long,
+		value_name = "raise|lower|mute-toggle|(±)number",
+		allow_negative_numbers = true
+	)]
 	pub input_volume: Option<String>,
 
 	/// Sets the maximum Volume
@@ -76,7 +84,11 @@ pub struct ArgsClient {
 	pub device: Option<String>,
 
 	/// Shows brightness osd and raises or loweres all available sources of brightness device
-	#[arg(long, value_name = "raise|lower|(±)number")]
+	#[arg(
+		long,
+		value_name = "raise|lower|(±)number",
+		allow_negative_numbers = true
+	)]
 	pub brightness: Option<String>,
 
 	/// Sets the minimum Brightness